multiple health disparities among minority adults with mobility limitations: an application of the...
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Multiple health disparities among minority adults with mobilitylimitations: An application of the ICF framework and codes
GWYN C. JONES & LISA B. SINCLAIR
Centers for Disease Control and Prevention, National Center on Birth Defects and Developmental Disabilities, Atlanta,
Georgia, USA
AbstractPurpose. To examine the interface between mobility limitations and minority status and its effect on multiple health andhealth-related domains among adults, using the framework of the International Classification of Functioning, Disability andHealth (ICF).Methods. We combined 8 years of data from the 1997 – 2004 US National Health Interview Survey to investigate healthdisparities among minorities with mobility limitations as defined by the ICF. A total of 79,739 adults surveyed met thesecriteria.Results. Adults with both mobility limitations and minority status experienced the greatest disparities (p5 0.001) inworsening health (adjusted odds ratio [AOR]¼ 8.5), depressive symptoms (AOR¼ 17.2), diabetes (AOR¼ 5.5),hypertension (AOR¼ 3.4), stroke (AOR¼ 7.2), visual impairment (AOR¼ 4.6), difficulty with activities of daily living(AOR¼ 42.7) and instrumental activities of daily living (AOR¼ 27.7), use of special equipment (AOR¼ 28.1), obesity(AOR¼ 3.3), physical inactivity (AOR¼ 2.7), and low workforce participation (AOR¼ 0.35).Conclusions. For most outcome measures, findings supported our hypothesis that persons with both mobilitylimitations and minority status experience greater health disparities than do adults with minority status or mobilitylimitations alone.
Keywords: Disability, ICF, mobility limitations, minorities
Introduction
Purpose
This paper uses the International Classification of
Functioning, Disability and Health (ICF) as a
framework to investigate the interface between
disability and minority status and its effects
on several outcome measures in health and
health-related domains [1]. The disability that is
the focus of this study is mobility limitation,
defined as difficulty walking and moving around
ICF codes (d450-d469) and changing or
maintaining body position (ICF codes d410-
d429) [1 – 3].
People with mobility limitations
Although mobility limitations are commonly asso-
ciated with advancing age, they can and do affect
adults of any age [3]. Promoting health, well-being,
and quality of life among people with mobility
limitations and other disabilities has become an
important public health goal [4 – 7]. Studies have
identified several national health concerns affecting
people with disabilities, including increased func-
tional difficulties and environmental barriers [8,9],
overall poor health [10], and depressive symptoms
[11 – 14]. In addition, research has shown that
people with mobility limitations can develop the
same chronic conditions and health risks that affect
adults without disabilities [8,12,15 – 17]. Other
Correspondence: Gwyn C. Jones, PhD, MSW, Med, Health Scientist, Centers for Disease Control and Prevention, National Center on Birth Defects
and Developmental Disabilities, 1600 Clifton Road, NE, MS-E88 Atlanta, GA 30333, USA. Tel: þ1 404 498 4493. Fax: þ1 404 498 3050.
E-mail: [email protected]
Disability and Rehabilitation, 2008; 30(12 – 13): 901 – 915
ISSN 0963-8288 print/ISSN 1464-5165 online ª 2008 Informa UK Ltd.
DOI: 10.1080/09638280701800392
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studies have addressed adverse health behaviours
among adults with disabilities, such as tobacco [16 –
18] and alcohol use [16,19], obesity [16,19 – 24],
and physical inactivity [16,25 – 27].
Ethnic and racial minorities
Over the past two decades, disparities in adverse
health behaviours and chronic conditions among US
ethnic and racial minorities have been well docu-
mented [5,28 – 30]. Disparities in overall health
status and quality of life have been noted among
these groups [31 – 34]. Researchers have also voiced
concerns about depression among racial and ethnic
minorities and have urged practitioners and policy
makers to incorporate cultural aspects of race and
ethnicity into diagnosis and treatment of health
problems [35 – 38]. Sufficient data indicate that
tobacco and alcohol use [16,39 – 42] and physical
inactivity and obesity [43,45] are prevalent health
risk behaviours among various ethnic and racial
minority groups. Chronic conditions greatly affecting
minorities include hypertension, cardiovascular dis-
ease, cancer, diabetes, and visual impairment [5,28 –
30,46 – 50]. To address these and other health
concerns, calls to action have risen across the USA
to eliminate ethnic and racial disparities and to
establish minority health agenda items [5,51 – 53].
Ethnic and racial minorities with mobility limitations
In 1997, Turk et al. asserted that no literature existed
about the effects of race, class, and gender on the
health status of persons with disabilities [54]. A
search identified available literature in this emerging
area [55]. In a series of articles on spinal cord injury,
Krause noted issues related to ethnicity and race with
overall well-being, depression, and health outcomes
[56 – 61]. Health behaviour studies show that smok-
ing and drinking [62 – 64], physical inactivity
[65,66], and obesity [23,24,67,68] are prominent
risk behaviours among various racial and ethnic
minorities with disabilities. Although depression,
respiratory problems, cardiovascular problems, and
diabetes ranked in the top half of reported secondary
conditions among Native Americans with physical
disabilities [69], chronic secondary conditions
among all minorities with mobility limitations are
not well documented. This study will contribute
much-needed nationally representative data on over-
all reported health status, depressive symptoms,
commonly occurring chronic conditions, functional
activities and participation, and health risk beha-
viours for minorities with mobility limitations. While
ethnic and racial minorities have always been
represented in Healthy People, the HP2010 plan
represents the first deliberate establishment of US
health objectives for people with disabilities. As with
ethnic and racial minority groups, the data indicate
that people with disabilities experience persistent
health disparities [17]. In this study, we examine
health disparities for persons with both of these
human attributes.
The International Classification of Functioning,
Disability and Health
Health and risk assessments from the epidemiologic
studies described previously employed useful but
non-standardized measures. Over the past decade,
however, discussions have ranged from acknowl-
edging [70,71] and summarizing [4,72 – 74], to
operationally examining, the International Classifica-
tion of Functioning, Disability and Health (ICF) [75 –
81]. The ICF was developed by the World Health
Organization (WHO) as a companion tool to the
International Classification of Diseases (ICD). Its
purpose is to promote understanding of functioning,
disability, and health by describing these concepts in
terms of health domains and health-related domains
associated with body functions and structures and
activities and participation. It offers a framework for
describing the interactive effects of functioning,
personal activities, social participation, and environ-
mental influences [1]. Among its important features
is the potential to standardize communication within
the classification scheme across disciplines, assess-
ment tools, and continents [82]. The ICF has been
used to create health assessment tools [82 – 84] and
to identify components in other existing tools that are
ICF-related [9,78,83 – 90]. The approach to define
mobility limitations undertaken by Hendershot
(2003) seems directly relevant to this epidemiologic
study [85].
The ICF precursor, the International Classifica-
tion of Impairments, Disabilities, and Handicaps
(ICIDH), was used to derive measures of disability
in the Survey of Income Programme Participation
(SIPP) [83] and as a framework for the 1994 – 1995
US National Health Interview Survey (NHIS)
Disability Supplement [84]. The ICF has been used
more recently to retrospectively map mobility func-
tions in the 1997 NHIS [85]. The current study uses
nationally representative data and the ICF to define
mobility limitations and examine links between
mobility limitations, commonly occurring chronic
conditions, functional activities and participation,
and health behaviours among racial and ethnic
minority and non-minority adults.
Methods
In this retrospective, cross-sectional study, we
examined the interface between mobility limitations
902 G. C. Jones & L. B. Sinclair
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and minority status to identify subpopulations of
adults aged 18 and older who may be experiencing
significant health disparities in several health and
health-related domains. We addressed the following
questions: (i) What is the prevalence of minority
status among adults with mobility limitations? (ii)
How do adults with mobility limitations who are also
members of racial and ethnic minorities differ
demographically from other subgroups?, and (iii) In
what health and health-related domains are adults
with mobility limitations and minority status most
likely to experience significant health disparities? We
defined health disparities as statistically significant
differences between comparison groups for outcome
measures such as health status, chronic conditions,
and health behaviours. We hypothesized a stronger
association between multiple health disparities and
the combination of mobility limitations and minority
status than between disparities and mobility limita-
tions or minority status alone.
Data source
The National Health Interview Survey (NHIS) is a
nationally representative, face-to-face interview sur-
vey of the non-institutionalized civilian population
living in the USA [91]. It is conducted annually by
the US Census Bureau and the National Centre for
Health Statistics (NCHS), Centers for Disease
Control and Prevention, to gather health-related
information about households and individuals.
For decades, the NHIS has been used widely by
health services researchers to address issues of
chronic disease, health status, health risks, and
disability. Since 1997, one adult has been selected
from each surveyed household to participate in the
Sample Adult Core module of the survey.
We focused our investigation on data collected
from the 30,000 or more sample adults selected in
each year of the survey from 1997 to 2004. We made
this choice because the Sample Adult Core contains
specific information about commonly occurring
chronic conditions and health behaviours that is
not found in the main survey of children and
adults or in other survey components for adults.
Additionally, because all but a tiny fraction of
participants in the Sample Adult Core were self-
responding, we were able to virtually eliminate proxy
bias. We chose data from 1997 – 2004 because the
survey design was consistent over that period. The
survey files contain no personal identifiers and are
available to any interested investigator from the
NCHS website.
Beginning with the 1997 adult core questionnaire
[92] as our baseline, we examined survey question-
naires for each survey year. We selected items of
interest that were asked of all sample adults for each
of the 8 years of the survey. Since each item in the
NHIS questionnaires is associated with variables in
the data set for each individual year, we developed a
variable crosswalk (grid) for all variables of interest.
This procedure ensured that each selected variable
measured the same construct across our 8 survey
years. We imported our sample adult data into SPSS
14.0 for Windows [93], creating one data file for
each year from 1997 to 2004. We kept only target
variables in each file, recoding names where neces-
sary and verifying that all variable values measured
the same construct in each individual file, to ensure
parity across files. After ensuring that all eight sample
adult files were identical in content, we merged the
files, using recommended NCHS procedures [91].
We combined the survey years to avoid small cell
sizes that commonly plague disability research. We
repeated these procedures for importing and clean-
ing all other survey data files that contained demo-
graphic and functional status measures not found in
the sample adult files. We divided each final annual
weight in these files by 8, the number of survey years
in our data set, to obtain accurate national estimates
for outcome measures contained in these files [91].
Finally, we back coded (matched) NHIS survey
questions used in selecting variables for the analysis
to the ICF framework [77,85].
Data analysis
We analysed data from our combined survey files to
examine the effects of mobility limitation and
minority status on measures of (i) health status,
(ii) commonly-occurring chronic conditions, (iii)
functional activities and participation, and (iv)
health behaviours among adults aged 18 years and
older. For the workforce participation measure, we
included only adults who were 18 – 64 years old.
We evaluated associations between dichotomous
outcomes and covariates of interest, using frequency
tables (cross-tabulations) for individual covariates
and logistic regression for collections of covariates
of interest. For polychotomous outcome measures,
we fit generalized logit models, using the same
independent predictors that we used in our logistic
modeling.
Because of the complex stratified cluster sampling
design used in conducting the NHIS, we used
SUDAAN 9.0 computer software [94,95] to estimate
the standard errors, to take into account both the
sampling weights and the multistage clustering de-
sign of the survey. In all cross-tabulations and logistic
models, we tested for effects of mobility limitation,
minority status, and the combination of these two
predictors. In the logistic regression procedures, the
effects of interest were evaluated after adjusting
for age and sex. We had a sample of more than
Ethnic and racial minorities with mobility limitations 903
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258,000 self-responding adults, aged 18 years and
older. This group served as the denominator for
many of our analyses.
Independent measures
Mobility limitations. We derived our definition of
mobility limitations from the ICF and from current
literature on disability and health [1,14,85]. In the
ICF, specific codes are assigned to each health and
health-related domain [1]; questions in the NHIS
on functioning, activities, and participation are
based on the ICF codes [85]. We chose NHIS
questions related to two domains in the Mobility
section of the ICF: changing and maintaining body
position (ICF codes d410-d429), and walking and
moving (ICF codes d450-d469) [1,85,92]. We
defined mobility limitations as difficulty walking
¼ mile, difficulty climbing 10 steps without
resting, difficulty bending or stooping, or difficulty
with sustained sitting or standing [14]. Because we
were interested in adults with mobility limitations
as a group, we did not apply ICF qualifiers that are
associated with the d-codes.
Ethnic and racial minority status. All respondents who
said that they were members of a US minority racial
or ethnic group were classified as having minority
status. Respondents who reported that they were
Hispanic, African American, Asian, Pacific Islander,
Native American, or of multiple racial and ethnic
origin, were included in this category. Non-Hispanic
whites served as the comparison group for minority
respondents.
Dependent measures
For each of our four comparison groups – adults with
both mobility limitations and minority status, adults
with mobility limitations alone, adults with minority
status alone, and adults with neither mobility
limitations nor minority status – we examined 5
demographic measures, 2 health status measures, 10
commonly occurring chronic conditions, 4 measures
of functional activities and participation, and 6
measures of health behaviours.
Demographics. We selected age groups (18 – 24
years, 25 – 44 years, 45 – 64 years, and 65 years and
older) commonly used in data reports published by
NCHS [96] to describe our sample. Both age group
and sex were used in all logistic regression models.
We also looked at the covariates education (high
school or less vs more than high school), annual
income (�$20,000 vs 5$20,000), and marital status
(married, not married) to identify demographic
disparities in our sample.
Health status. Physical health and mental health play
crucial roles in the daily and long-term functioning,
community participation, and well-being of people
with disabilities [11]. We were particularly interested
in identifying groups that were at higher risk of
worsening health because intervention in these
domains can enhance and maintain quality of life
for people with disabilities. We compared two
summary measures of health status: physical health
(health better, worse, or about the same as 12
months ago) and symptoms of depression (mild,
moderate, severe, or no symptoms). For compar-
isons of health status, respondents who reported that
their health remained the same over the past 12
months served as our reference group.
For comparisons on depressive symptoms (ICF
codes b152-b159), no similar variable was available
for our mental health measure. We constructed a
measure for depressive symptoms (mild, moderate,
severe, no symptoms) based on responses to survey
variables used in the Kessler K6 Scale [97 – 100]. For
almost a decade, the K6 Scale has been a part of the
World Health Organization’s series of screening
surveys. Over time, it has demonstrated sensitivity
and specificity in detecting the prevalence of mood
and anxiety disorders [101]. The K6 Scale includes
questions on feelings of sadness, hopelessness,
nervousness, restlessness, worthlessness, and the
sense that everything is an effort, that significantly
interfere with the respondent’s daily activities [92].
The NHIS incorporates these questions in its sample
adult questionnaires. Respondents are asked to rate
the extent to which each feeling interfered with their
activities: none of the time, a little of the time, some
of the time, most of the time, and all of the time.
Thus each respondent could rank level of difficulty
caused by each of these feelings from 1 to 5, with 1
indicating the most difficulty and 5 indicating the
least difficulty. We reverse-coded the values for these
six variables and summed across variable scores
(unweighted) for each respondent to obtain the
respondent’s K6 Scale score. We then recoded K6
Scale scores in the following way: Respondents with
a score of 6 were rated as having no symptoms of
depression (ICF qualifier¼ 0). They served as our
reference group for study comparisons on level of
depressive symptoms; scores of 7 – 12 indicated mild
symptoms that were problematic a little of the time
(ICF qualifier¼ 1); scores of 13 – 18 indicated
moderate symptoms that were problematic some of
the time (ICF qualifier¼ 2); and scores of 19 or
higher indicated severe depressive symptoms that
were problematic most of the time or all of the time
(ICF qualifier¼ 3).
Commonly occurring chronic conditions. Because the
presence of chronic health conditions may intensify
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the effects of a disability and may cause further
health declines in adults with mobility limitations,
we examined data on 10 commonly occurring
chronic conditions. Six of these conditions (dia-
betes, hypertension, stroke, heart problems, breath-
ing problems, and cancer) were diagnosed by a
physician. Respondents were included in the heart
problem category (ICF codes b410-b429) if they
reported physician-diagnosed myocardial infarction,
angina, coronary heart disease, or other heart
problems. Respondents were included in the
breathing problems category (ICF codes b440-
b449) if they reported having physician-diagnosed
emphysema, asthma, or chronic bronchitis. We did
not have enough information to attribute disability
causality to a specific condition. Respondents were
identified as having joint symptoms (ICF codes
b280-b289) and low back pain (ICF code b28013)
by self-report. Our hearing impairment (ICF code
b230) and visual impairment (ICF codes b210-
b229) measures were also self-reported as difficulty
hearing and trouble seeing, even with glasses or
contact lenses.
Functional activities, social participation, and environ-
ment. We included four measures of functional
status: difficulty with activities of daily living
(ADLs) such as eating, dressing, and bathing
(ICF codes d510-d599); difficulty with instrumen-
tal activities of daily living (IADLs) such as
shopping for groceries (ICF codes d610-d629),
doing housework (ICF codes d630-d669), socializ-
ing with friends and family (ICF codes d710-779),
and participation in community events (ICF codes
d910-d999); use of special equipment such as
canes and wheelchairs to negotiate the environment
(ICF codes e110-e129); and participation in the
workforce (for adults age 18 – 64 years, ICF codes
d840-d859).
Health behaviours. We examined six measures of
health behaviours for each group of adults, including
current smoking (every day or some days per week)
and current drinking (at least once per week),
overweight but not obesity, obesity, morbid obesity,
and physical inactivity. We included all alcohol use
because people with mobility limitations often take
multiple prescription medications on a regular basis,
and many of these medications indicate on their
labels that they should not be taken by persons who
are drinking any alcohol. Research has shown that
commonly prescribed drugs, such as nonsteroidal
anti-inflammatory drugs (NSAIDs) and selective
serotonin reuptake inhibitors (SSRIs) can have
adverse health outcomes for people who use alcohol
while taking them [102,103]. We used three mea-
sures to indicate levels of weight control problems
(ICF code b530): overweight, but not obesity (BMI
�25 but 530), obesity (BMI� 30, and a subgroup
of obesity – morbid obesity (BMI� 40) [67,91].
Respondents were categorized as being physically
inactive if they did not exercise at least once a week,
or if they never exercised at all. Our intention was to
identify adults who were the most physically inactive,
rather than those who met any national exercise
criteria.
Results
Population
Table I describes our study population by sample size,
percentages, and weighted population estimates.
Our unweighted total sample size for the 1997 –
2004 study period was 258,279 adults aged 18 years
and older. Totals differed for some analytical
procedures, depending on response rates for specific
survey items. Respondents who said that they had
any difficulty performing activities related to chan-
ging and maintaining body position or to walking
and moving around without the help of another
person or without using special equipment were
categorized as having a mobility limitation. A total of
79,739 adults reported having a mobility limitation.
Persons with no difficulty performing these activities,
and who used no special equipment were included in
the ‘no mobility limitation’ category. A total of
87,562 adults met the criteria for minority status.
Table I. Sample sizes and population estimates.
N Weighted % 95% CI Population estimate
Mobility limitations 79,739 28.9 28.6, 29.3 59,013,495
No mobility limitations 178,540 71.1 70.7, 71.4 144,959,746
Minority status 87,562 26.4 25.8, 27.0 53,798,323
Non-minority status 170,627 73.6 73.0, 74.2 150,176,919
Mobility limitations and minority status 22,633 21.2 20.5, 21.9 12,524,312
No mobility limitations, non-minority status 113,521 71.5 70.5, 72.2 103,687,735
CI, confidence interval. Data source: Author calculations based on National Health Interview Survey (1997 – 2004). Hyattsville, MD:
Centers for Disease Control and Prevention, National Center for Health Statistics. Accessed 5 January 2006 from: http://www.cdc.gov/nchs/
nhis.htm
Ethnic and racial minorities with mobility limitations 905
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A total of 22,633 respondents reported both mobility
limitations and minority status.
Demographics
Our findings on demographic characteristics are
summarized in Table II.
The distribution of adults with mobility limitations
was skewed toward the 65-and-older age group
(33.9%). Females predominated among minorities
(52.3%), adults with mobility limitations (59.7%),
and adults with mobility limitations who were
members of a minority group (62.5%). Adults with
mobility limitations who were also members of
minority groups were the most likely to have low
educational attainment (64.8%), to have annual
incomes below $20,000 (51.2%), and to be unmar-
ried (65.9%).
Findings for health status, depressive symptoms,
commonly occurring chronic conditions, functional
activities and participation, and health behaviours are
summarized in Table III. Findings reported in Table
III for main and interactive effects were significant at
p5 0.001 for chi square tests and adjusted odds
ratios (AOR).
Health status
Adults in minority groups were the most likely to
report that their health was better than it was a year
ago (19.4%, AOR¼ 1.2). We had no way to
determine what the prior year level of health status
was for our comparison groups, so it is difficult to
know exactly what ‘better health’ means for mino-
rities. Percentages of having worse health increased
across comparison groups, with adults with mobility
limitations who were members of minority groups
reporting the highest percentage of worse health
(22.2%, AOR¼ 8.5 vs 3.5%, AOR¼ 1.0 for adults
with neither attribute of interest). Adults with neither
mobility limitations nor minority status were the
most likely to report stable health (79.9%,
AOR¼ 1.0).
Depressive symptoms
The highest percentage of respondents with mild
depressive symptoms (46.7%, AOR¼ 3.2) was
among adults with mobility limitations. Adults with
both mobility limitations and minority status were
the most likely to report experiencing moderate
(18.4%, AOR¼ 8.9) or severe depressive symptoms
(9.0%, AOR¼ 17.2).
Commonly occurring chronic conditions
We examined 10 commonly occurring chronic
conditions for each of our comparison groups. Our
analysis of main effects revealed that minorities were
more likely than non-minorities to have diabetes
Table II. Demographic characteristics of adults with mobility limitations by minority status.
Domains
No mobility
limitations,
non-minority status Minority status Mobility limitations
Mobility limitations
and minority status
% 95% CI % 95% CI % 95% CI % 95% CI
Age
18 – 24 years 14.7 14.2, 15.2 17.2 16.8, 17.7 5.1 4.9, 5.4 7.1 6.6, 7.6
25 – 44 years 44.7 44.2, 45.1 47.0 46.4, 47.5 24.6 24.2, 25.1 30.6 29.7, 31.5
45 – 64 years 30.2 29.7, 30.6 25.8 25.3, 26.3 36.4 35.9, 36.9 36.6 35.7, 37.5
�65 years 10.5 10.2, 10.8 10.0 9.6, 10.4 33.9 33.3, 34.5 25.7 24.7, 26.7
Sex
Male 51.2 50.9, 51.6 47.7 47.3, 48.2 40.3 39.9, 40.7 37.5 36.7, 38.2
Female 48.8 48.4, 49.1 52.3 51.8, 52.7 59.7 59.3, 60.1 62.5 61.8, 63.3
Education completed
�High school 39.1 38.4, 39.8 56.6 55.8, 57.4 56.3 55.6, 56.9 64.8 63.8, 65.8
4High school 60.9 60.2, 61.6 43.4 42.6, 44.2 43.7 43.1, 44.4 35.2 34.2, 36.2
Annual income
�$20,000 75.8 75.3, 76.3 59.9 59.1, 60.6 60.2 59.6, 60.8 48.8 47.6, 49.0
5$20,000 24.2 23.7, 24.7 40.1 39.4, 40.9 39.8 39.2, 40.4 51.2 50.0, 52.4
Marital status
Married 52.8 52.1, 53.5 41.0 40.3, 41.6 44.4 43.8, 45.0 34.1 33.2, 35.1
Not married 47.2 46.5, 47.9 59.9 58.4, 59.7 55.6 55.0, 56.2 65.9 64.9, 66.8
CI, confidence interval. Data source: Author calculations based on National Health Interview Survey (1997 – 2004). Hyattsville, MD:
Centers for Disease Control and Prevention, National Center for Health Statistics. Accessed 5 January 2006 from: http://www.cdc.gov/nchs/
nhis.htm
906 G. C. Jones & L. B. Sinclair
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Tab
leII
I.H
ealt
hd
isp
arit
ies
amo
ng
min
ori
ties
wit
hm
ob
ilit
ylim
itat
ion
s.
Do
mai
ns
No
mo
bilit
ylim
itat
ion
s,
no
n-m
ino
rity
stat
us*
Min
ori
tyst
atu
s
Mo
bilit
ylim
itat
ion
s
(IC
Fco
des
d4
10
-d4
29
,
d4
50
-d4
69
)
Mo
bilit
ylim
itat
ion
san
d
min
ori
tyst
atu
s
%A
OR
AO
R9
5%
CI
%A
OR
AO
R9
5%
CI
%A
OR
AO
R9
5%
CI
%A
OR
AO
R9
5%
CI
Hea
lth
statu
s
Bet
ter
16.5
1.0
–1
9.4
1.2
1.1
,1
.21
7.4
1.5
1.4
,1
.51
9.2
1.7
1.6
,1
.8
Wo
rse
3.5
1.0
–8
.11
.20
1.1
6,
1.2
42
0.0
7.0
6.8
,7
.32
2.2
8.5
8.1
,8
.9
Sam
e*7
9.9
1.0
–7
2.5
1.0
–6
2.6
1.0
–5
8.6
1.0
–
Dep
ress
ive
sym
pto
ms
(IC
Fco
des
b152-b
159)
Mild
(IC
FQ
ual
ifier¼
1)
37.3
1.0
–3
2.9
0.7
00
.68
,0
.71
46
.73
.23
.1,
3.2
41
.12
.42
.3,
2.5
Mo
der
ate
(IC
FQ
ual
ifier¼
2)
4.8
1.0
–8
.60
.97
0.9
4,
1.0
31
5.4
8.6
8.3
,8
.91
8.4
8.9
8.4
,9
.4
Sev
ere
(IC
FQ
ual
ifier¼
3)
1.2
1.0
–3
.31
.11
.0,
1.2
7.0
15
.01
4.2
,1
5.8
9.0
17
.21
5.9
,1
8.7
No
ne*
(IC
FQ
ual
ifier¼
0)
56.7
1.0
–5
5.2
1.0
–3
0.9
1.0
–3
1.2
1.0
–
Com
mon
lyoc
curr
ing
chro
nic
condit
ions
Dia
bet
es2.9
1.0
–7
.31
.81
.7,
1.9
13
.43
.02
.9,
3.1
18
.55
.55
.2,
5.8
Hyp
erte
nsi
on
16.5
1.0
–2
2.4
1.3
1.3
,1
.44
2.2
2.3
2.3
,2
.44
6.3
3.4
3.3
,3
.6
Str
oke
0.7
1.0
–2
.01
.31
.2,
1.4
6.3
5.4
5.0
,5
.96
.97
.26
.5,
8.0
Hea
rtp
rob
lem
s(I
CF
cod
esb
41
0-b
42
9)
7.0
1.0
–7
.40
.74
0.7
1,
0.7
72
3.9
3.0
2.9
,3
.11
9.7
2.4
2.3
,2
.6
Bre
ath
ing
pro
ble
ms
(IC
Fco
des
b4
40-b
44
9)
10.5
1.0
–1
1.1
0.7
90
.77
,0
.82
21
.32
.62
.5,
2.7
20
.12
.22
.1,
2.3
Lo
wb
ack
pai
n(I
CF
cod
eb
28
01
3)
20.0
1.0
–2
3.8
0.8
10
.79
,0
.84
49
.54
.74
.6,
4.8
49
.24
.24
.0,
4.3
Join
tsy
mp
tom
s(I
CF
cod
esb
28
0-b
28
9)
25.5
1.0
–2
7.4
0.6
50
.63
,0
.67
66
.75
.75
.5,
5.8
61
.64
.24
.0,
4.4
Can
cer
5.2
1.0
–2
.60
.40
0.3
8,
0.4
21
2.6
1.7
1.6
,1
.86
.30
.78
0.2
7,
0.8
4
Vis
ual
imp
airm
ent
ICF
cod
es(b
21
0-b
22
9)
4.9
1.0
–8
.41
.09
1.0
5,
1.1
41
9.9
4.0
3.9
,4
.22
1.4
4.6
4.3
,4
.8
Hea
rin
gim
pai
rmen
tIC
Fco
de
(b2
30
)1
2.3
1.0
–8
.70
.50
0.4
8,
0.5
23
1.1
2.8
2.7
,2
.92
0.4
1.5
1.4
,1
.6
Funct
ional
act
ivit
ies
and
part
icip
ati
on
Dif
ficu
lty
wit
hA
DL
s(I
CF
cod
esd
51
0-d
59
9)
0.1
1.0
–1
.91
.71
.6,
1.8
5.4
26
.62
3.2
,3
0.4
7.0
42
.73
6.1
,5
0.7
Dif
ficu
lty
wit
hIA
DL
s(I
CF
cod
esd
61
0-6
69
,d
71
0-d
77
9,
d9
10
-d9
99
)0.5
1.0
–4
.21
.41
.3,
1.5
13
.22
0.3
18
.8,
22
.01
5.0
27
.72
5.0
,3
0.6
Use
of
spec
ial
Eq
uip
men
t(I
CF
cod
ese1
29)
0.7
1.0
–4
.81
.41
.3,
1.5
16
.72
2.1
20
.5,
23
.81
8.9
28
.12
5.6
,3
0.8
Par
tici
pat
ion
inw
ork
forc
e**
(IC
Fco
des
d8
40
-84
9)
74.0
1.0
–6
4.4
0.7
50
.73
,0
.78
55
.80
.49
0.4
8,
0.5
14
8.7
0.3
50
.34
,0
.37
Hea
lth
behavio
urs
Cu
rren
tsm
oker
23.5
1.0
–1
9.8
0.7
30
.70
,0
.75
23
.91
.51
.5,
1.6
22
.81
.21
.1,
1.3
Cu
rren
td
rin
ker
70.9
1.0
–5
0.7
0.4
50
.43
,0
.47
53
.20
.78
0.7
7,
0.8
04
3.0
0.3
90
.37
,0
.41
Wei
gh
tm
anag
emen
tp
rob
lem
s(I
CF
cod
esb
53
0)
Ove
rwei
gh
t,n
ot
ob
ese
34.3
1.0
–3
4.0
1.0
61
.04
,1
.09
32
.60
.88
0.8
6,
0.9
03
1.2
0.8
70
.85
,0
.92
Ob
ese
15.8
1.0
–2
4.0
1.4
1.3
,1
.43
0.8
2.4
2.3
,2
.43
6.7
3.3
3.1
,3
.4
Mo
rbid
lyo
bes
e1.2
1.0
–3
.41
.61
.5,
1.8
5.4
4.8
4.5
,5
.17
.97
.87
.1,
8.6
Phys
ical
inact
ivit
y3
1.3
1.0
–4
9.4
1.9
1.9
,2
.05
0.1
1.6
1.5
,1
.65
8.5
2.7
2.6
,2
.8
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Ethnic and racial minorities with mobility limitations 907
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(7.3% vs 2.9%), hypertension (22.4% vs 16.5%),
stroke (2.0% vs 0.7%), heart problems (7.4% vs
7.0%), breathing problems (11.1% vs 10.5%), low
back pain (23.8% vs 20.0%), joint problems (27.4%
vs 25.5%), and visual impairment (8.4% vs 4.9%).
However, in the logistic regression models, the racial
and ethnic differences for heart problems, breathing
problems, low back pain, joint problems, and hearing
impairment disappeared when we controlled for age,
sex, and mobility limitations status. Some of these
conditions were more problematic for adults with
mobility limitations alone than they were for
individuals with mobility limitations and minority
status. Adults with mobility limitations alone had the
highest percentages for 6 of these conditions: heart
problems (23.9%, AOR¼ 3.0), breathing problems
(21.3%, AOR¼ 2.2), low back pain (49.5%,
AOR¼ 4.7), joint symptoms (66.7%, AOR¼ 5.7),
cancer (12.6%, AOR¼ 1.7), and hearing impairment
(31.1%, AOR¼ 2.8).
For the remaining conditions, the percentages
increased across comparison groups with adults who
had both mobility limitations and minority status
reporting the highest percentages. These conditions
included diabetes (18.5%, AOR¼ 5.5), hypertension
(46.3%, AOR¼ 3.4), stroke (6.9%, AOR¼ 7.2), and
visual impairment (21.4%, AOR¼ 4.6).
Functional activities and social participation
We examined three outcome measures for functional
activities for all adults in our sample and one
measure of community participation for adults 18 –
64 years old. The occurrence of difficulty with ADLs
such as eating, bathing, and dressing increased
across comparison groups, with the lowest occur-
rence among non-minority adults without mobility
limitations (0.1%, AOR¼ 1.0), and the highest
occurrence among adults with both mobility limita-
tions and minority status (7.0%, AOR¼ 42.7). The
same pattern occurred for difficulties with IADLs
such as doing housework, preparing meals, shopping
for groceries and other necessities, and socializing
with family and friends. Adults with neither minority
status nor mobility limitations reported the lowest
level of difficulty with these activities (0.5%,
AOR¼ 1.0), compared with 15.0% (AOR¼ 27.7)
of adults with mobility limitations and minority
status. The same pattern held true for use of special
equipment, such as a cane or wheelchair, to negotiate
the environment. Adults with neither attribute of
interest were the least likely to report using special
equipment (0.7%, AOR¼ 1.0), compared with
adults with both mobility limitations and minority
status (18.9%, AOR¼ 28.1). Among adults aged
18 – 64 years old, nearly three-fourths of adults
without mobility limitations and with non-minority
status (74.0%, AOR¼ 1.0) reported that they were
currently working at a job or business. Workforce
participation dropped to 64.4% (AOR¼ 0.75) for
minorities, to 55.8% (AOR¼ 0.49) for adults with
mobility limitations, and to 48.7% (AOR¼ 0.35) for
adults with mobility limitations who also belong to a
racial or ethnic minority group.
Health behaviours
We examined six measures of health risk behaviours
for our sample of survey respondents: current
smoking, current drinking, overweight but not
obesity, obesity, morbid obesity, and physical in-
activity.
Current smoking. Adults were classified as current
smokers if they smoked cigarettes daily or several
days per week. Members of minority groups were the
least likely to be current smokers (19.8%,
AOR¼ 0.73), and adults with mobility limitations
were the most likely to smoke on a weekly basis
(23.9%, AOR¼ 1.5).
Current drinking. Adults who consumed some alcohol
on a weekly basis were included in the current
drinker category. More than 70% of adults with no
mobility limitations and no minority status said that
they consumed some alcohol on a weekly basis.
Adults with mobility limitations were the next most
likely to use alcohol weekly (53.2%, AOR¼ 0.78).
Slightly more than half (50.7%, AOR¼ 0.45) of
minority adults without limitations drank some
alcohol each week. Adults with mobility limitations
and minority status were the least likely group to use
alcohol on a weekly basis (43.0%, AOR¼ 0.39).
Overweight but not obesity. Adults whose body mass
index (BMI) ranged from 25 to 29.9 were classified
as being overweight but not obese. We found that
adults with neither mobility limitations nor minority
status were the most likely individuals to meet these
criteria (34.3%, AOR¼ 1.0). The percentages of
overweight declined across comparison groups, with
adults who had both mobility limitations and
minority status having the lowest percentage of
people who met the overweight criteria (31.2%,
AOR¼ 0.87).
Obesity. Adults whose BMI was 30 or more met the
criteria for obesity. The occurrence of obesity in our
sample increased across comparison groups. Adults
with neither mobility limitations nor minority status
were the least likely group to be obese (15.8%,
AOR¼ 1.0). For adults who were members of racial
and ethnic minority groups, obesity rose to 24.0%
(AOR¼ 1.4). Obesity rose to 30.8% (AOR¼ 2.4)
908 G. C. Jones & L. B. Sinclair
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among adults with mobility limitations, and to
36.7% (AOR¼ 3.3) among adults with both mobility
limitations and minority status.
Morbid obesity. A subgroup of adults who met the
criteria for obesity was classified as morbidly obese if
their BMI was 40 or higher. We found the same
pattern for morbid obesity as for obesity. Adults
without mobility limitations or minority status were
the least likely to be morbidly obese (1.2%,
AOR¼ 1.0), while morbid obesity increased to
3.4% (AOR¼ 1.6) for minorities, to 5.4%
(AOR¼ 4.8) for adults with mobility limitations,
and to 7.9% (AOR¼ 7.8) for adults with both
mobility limitations and minority status.
Physical inactivity. Adults were categorized as physi-
cally inactive if they did not engage in some form of
moderate or vigorous exercise on a weekly basis, or if
they never exercised at all. Similar to obesity and
morbid obesity for adults in our sample, physical
inactivity rose across comparison groups. Physical
inactivity was reported by 31.3% (AOR¼ 1.0) of
adults without mobility limitations and minority
status, 49.4% (AOR¼ 1.9) of adults with minority
status, 50.1% (AOR¼ 1.6) of adults with mobility
limitations, and 58.5% (AOR¼ 2.7) of adults with
both mobility limitations and minority status.
We found several patterns of disparities in the health
and health-related domains reported here. Compared
with adults with no mobility limitations, people with
mobility limitations were more likely to have worsen-
ing health, symptoms of depression, all chronic
conditions represented here, difficulties with ADLs
and IADLs, and difficulties with workforce participa-
tion. Although the confidence intervals for ADLs
among adults with mobility limitations and minority
status were wider than what is customarily acceptable
for data stability, the findings were still statistically
significant at p50.001 for this outcome measure.
Adults with mobility limitations and minority status
were also more likely than adults without limitations to
be current smokers, to be obese or morbidly obese,
and to be physically inactive. In cases where disparities
existed between minorities and non-minority, non-
limited adults on measures such as worsening health,
moderate and severe depressive symptoms, diabetes,
hypertension, stroke, visual impairment, difficulties
with ADLs and IADLs, workforce participation,
obesity, morbid obesity, and physical inactivity, adults
with both mobility limitations and minority status had
the greatest differences.
Discussion
To understand how disability affects an individual,
one must look beyond the diagnosis of a particular
mental or physical condition to the influence of the
built environment, social and cultural attitudes and
practises, and national policies affecting disability
and health [4,105 – 107]. While no existing national
data set incorporates all of these elements [4], our
study attempts to map the person-in-environment
relationship to disability and health [107] by applying
the ICF to nationally representative data on disability
and its interface with minority status for several
health and health-related domains [1].
This study has important implications for oper-
ationalizing the ICF; identifying links between
mental and physical health status, commonly occur-
ring chronic conditions, functional activities, parti-
cipation, and one’s environment; and affirming the
impact of race and ethnicity on health in the USA.
These endeavors have been difficult to accomplish to
date because of a lack of national surveillance of
important participation and environmental factors
that enhance or negatively impact health. An
approach to including such questions in the NHIS
has been piloted to obtain data for Healthy People
2010 objective 6 – 10 (access to health and wellness
programmes), 6 – 11 (having needed assistive devices
and technology), and 6 – 12 (environmental barriers
affecting participation in home, school, work, and
community) [5]. The data were collected in 2002
and partly published in DATA2010 [17]. In addition
to the specific chapter on disability in HP2010,
people with disabilities are included as a demo-
graphic group in other chapters, but the data are not
as current for this group, as they are for people
without disabilities [5]. Conversely, our paper
provides data parity for adults with and without
mobility limitations, and our findings highlight
disparities that have continued to exist over time.
In addition to including ICF domains in national
surveys, it will be useful to incorporate personal
health risk behaviours and the behaviours and
attitudes of health professionals in the ICF [4].
In planning this study and analyzing the data, we
attempted to map relationships between independent
and dependent measures by using ICF coding. In
some ways, we were successful, and in others, we
were blocked because no codes existed for some
critical health and health-related domains.
Defining disability
We used d4 codes from the Activities and Participa-
tion – Mobility section of the ICF (d410-d429) to
define mobility limitations in this study. By using
ICF codes to define our disability measures, we felt
that we could more accurately describe NHIS
respondents who were experiencing difficulties in
moving around in their homes and communities.
If specific diagnostic codes for the International
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Classification of Diseases (ICD) [109] had been
included with the chronic disease variables we used
in this analysis, we might have garnered most of our
present sample, but the diagnostic codes may not
have identified specific activities that respondents
said were difficult for them to perform. For this
investigation, we did not examine the severity of
difficulty in performing functional activities related
to moving around and changing body position, as
our purpose was to explore the effects of the interface
between racial and ethnic minority status and
mobility limitations at all levels of severity. However,
we do acknowledge the compelling effect of disability
severity on every aspect of life for people with
mobility limitations [16,85,110,111].
Physical health status
We found no specific codes for overall health status
in the ICF. We used the self-rating measure available
in the data set to measure this important construct.
Depressive symptoms
The ICF categorizes depressive symptoms and other
mood disorders in the Body Functioning section of
the taxonomy (ICF codes b152-b159), and qualifiers
are available to indicate severity of symptoms, but
there is no way to directly back code NHIS data on
depressive symptoms to the ICF without first
computing the K6 Scale, another WHO classification
system to study the effects of depressive symptoms
[102]. Depressive symptoms are more common
among people with mobility limitations than among
other disability groups, and they are more prevalent
among people with disabilities than among people
without disabilities [11,14], but limited cell sizes for
individuals who stated that they were limited all of
the time by their negative feelings prevented us from
applying the full range of available qualifiers for the
b1 codes. Our findings for moderate and severe
depressive symptoms among racial and ethnic
minorities with mobility limitations speak to the
need to incorporate larger numbers of minorities
with disabilities into the NHIS sampling frame to
obtain more stable estimates of minorities with
severe and complete impairments in mental health.
Commonly occurring chronic conditions
This is perhaps the first nationally representative US
epidemiologic study to use the ICF to examine
clusters of commonly occurring chronic conditions
among people with mobility limitations, including
ethnic and racial minorities. The ICF looks at organ
system functioning, rather than specific chronic
conditions [1]. Though the ICF was not designed
to address individual chronic conditions [73], this
study employs ICF codes for clustered groups of
chronic conditions within organ system functioning
(heart problems: b410-b429, breathing problems:
b440-b449, and joint symptoms: b280-b289) that
would otherwise be classified individually in the
ICD. Clearly, there is a need to study the overlap
between the ICD and the ICF for chronic conditions
and to continue efforts to develop guidelines for
mapping ICF domains to existing national surveys
[79 – 81]. In our analysis, we included everyone who
reported having the 10 commonly occurring chronic
conditions studied. Neither the ICF nor the NHIS
data provided enough information to allow us to
determine which conditions may have caused a
mobility limitation and which conditions were
secondary to a primary disability. We were hindered
in our mapping of the ICF framework to adults with
mobility limitations who were also members of racial
and ethnic minorities because the ICF has no codes
for personal factors, such as race and ethnicity,
gender, age, or marital status. Having such codes
would facilitate a more precise picture of our
population and help to identify demographic groups
needing timely intervention. A next reasonable step
is to identify other relevant ICF domains that are
associated with chronic conditions in people with
disabilities, not as a cause-and-effect model, but as a
model for targeted interventions.
Functional activities and participation in the
environment
We examined four measures of functional activities
and participation in the environment: difficulties
with ADLs such as eating, bathing, and dressing
(ICF codes d510-d559); difficulties with IADLs
such as shopping for groceries and other necessities
(ICF codes d610-d629), doing housework (ICF
codes d630-d669), socializing with family and
friends (ICF codes d710-d779); participating in
community events (ICF codes d910-d999); and
workforce participation for adults 18 – 64 years old
(ICF codes d840-d859). It is notable that the ICF
has codes for functional activities and participation,
but the ICF did not allow us the opportunity of
coding the severity of difficulty experienced by NHIS
participants. Indeed, Whiteneck (2006) and others
have noted the lack of specificity and difficulty with
consistent coding for activities and participation
domains [4,112].
The 1997 – 2004 NHIS has few questions relating
to disability-specific barriers and environmental
factors. We examined data related to ICF codes
e110-e129 for use of special equipment to negotiate
the environment, but our data set did not
include variables that would permit a more detailed
910 G. C. Jones & L. B. Sinclair
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assessment of assistive devices and equipment used
by survey respondents. In general, we found the
same pattern for this domain that held true for many
of our other outcome measures.
Health behaviours
Neither the ICD nor the ICF provides a standard
nomenclature for characterizing human behaviour.
With the exception of weight management pro-
blems (ICF code b530), we found no ICF codes
related to important health behaviour practises.
Mitra et al. (2005) found that smoking, obesity,
and physical inactivity were strongly correlated with
depression in people with disabilities [12]. Other
researchers have found a strong correlation be-
tween obesity and/or physical inactivity, mobility
limitations, and race and ethnicity [11,20,21]. The
absence of ICF codes for health behaviours
prevented us from mapping some crucial factors
documented in our study and in the work of other
researchers that strongly impact the health of
minorities with mobility limitations. Our findings
on behaviours underscore the need to make
behavioural health promotion programmes cultu-
rally appropriate and accessible to people with
disabilities, and to develop new strategies and
interventions universally accessible to people with
mobility limitations who also belong to a racial or
ethnic minority group. For example, an accessible
intervention might aim to help people with
mobility limitations, including minorities, select
nutritional foods and address barriers to physical
activity at home and within community health
promotion programmes, services, and facilities
[66,111].
Study limitations
This study has several limitations. First, our data
were self-reported by NHIS participants and are
subject to recall bias. The data are cross-sectional
with no time reference for the conditions studied.
Other than accounting for levels of physical health
status and depressive symptoms, the data do not
account for severity of mobility limitations or
severity of ADLs and IADLs. As a result, the
findings may not be generalizeable to populations
with mild or severe mobility limitations, or to
people with other types of disabilities. The NHIS
study population includes only non-institutionalized
civilian adults and does not identify people living in
nursing homes or other long-term care facilities.
Thus, our findings may not apply to adults with
severe disabilities living in these types of facilities.
We looked at minorities as a group because of small
cell sizes for some minorities with respect to our
low-prevalence outcome measures. Small cell sizes
would especially be true for logistic models with
several indicators in the model, making the findings
more unstable and less applicable to affected
subgroups.
Additionally, researchers do not agree on the
specificity in the ICF coding for activities and
participation [4,112]. ICF users often have
difficulty deciding if a particular factor would fit
best under Activities, which are usually performed
separately by an individual, or under Participation,
which includes activities typically performed with
others [4,112].
Conclusions
Our findings highlight several areas of health
disparities both for adults with mobility limitations
and for adults who have mobility limitations and
belong to a racial or ethnic minority group. These
disparities occur in the domains of mental and
physical health status, commonly occurring chronic
conditions, functional activities and social participa-
tion, and health behaviours. Our results also indicate
an urgent need for standing community-based health
promotion programmes and interventions that, from
the onset of planning, reflect human diversity that
includes various cultures and disabilities. We were
unable to identify any such programmes [55]. We
note that health promotion efforts tend to focus on
racial and ethnic culture or disability. For example,
REACH 2010 is a community-based initiative
targeting ethnic and racial minorities to prevent
prevalent chronic conditions, but having a chronic
condition does not necessarily indicate the presence
of a disability. Living Well with a Disability is a
community-based intervention that was originally
designed to improve the health of adults with
mobility impairments [113].
A community collaborative effort among these
programmes and organizations could substantially
enhance the health and well-being of minorities with
disabilities by bringing together multi-disciplinary
perspectives to health promotion for minorities with
disabilities.
Despite its limitations, this study contributes
uniquely to a better understanding of the links
between the ICF and the NHIS, an existing national
survey; chronic conditions among people with and
without mobility limitations; and the profound
impact of disability and race and ethnicity on health.
The ICF presents innovative opportunities to convey
standardized disability and health information across
disciplines and nationalities, but it can be vastly
improved by adding personal factor demographic
codes and providing more specificity for activity and
participation codes.
Ethnic and racial minorities with mobility limitations 911
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Disclaimer
The findings and conclusions in this paper are those
of the authors and do not necessarily represent the
views of the Centers for Disease Control and
Prevention.
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