adapted by the state of california chdp nutrition subcommittee from materials developed by...
TRANSCRIPT
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Adapted by the State of California CHDP Nutrition Subcommittee from materials developed byCalifornia Department of Health Care Services Children’s Medical Services Branch
Centers for Disease Control and PreventionMaternal and Child Health Bureau
May 2011
Assessing Child Growth Using Body Mass Index (BMI)-for-Age
Growth Charts
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Training Objectives
By the end of this presentation, you will be able to:• describe the use of Body Mass Index (BMI) as a
screening tool for overweight and obesity• calculate or determine BMI value from
measured weight and height• plot BMI value on the growth chart• determine BMI-for-age percentile• interpret weight category• record results on PM 160
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Obesity Trends in Children and Teens Receiving CHDP Exams
0
5
10
15
20
25
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
% ≥
95t
h pe
rcen
tile
[Insert County]CaliforniaExpected Level
CDC Pediatric Nutrition Surveillance System (PedNSS) Data, 2000-2009.Accessed online at www.dhcs.ca.gov/services/chdp/Pages/PedNSS2009.aspx (accessed 9/30/10).
Ages 5 to < 20
Customize chart with PedNSS data from your county. See User Guide.
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Childhood Overweight and Obesityby Age Group
[Insert Your County Name] 2009
15.9
18.7
18.3
22.5
20.2
29.0
20.8
26.2
19.7
21.8
0
10
20
30
40
50
% o
verw
eigh
t or o
bese
2 - < 5 Yrs 5 - 8 Yrs 9 - 11 Yrs 12 - 14 Yrs 15 - < 20 Yrs
Age Group
≥ 95th %ile85th - < 95th %ile
CDC Pediatric Nutrition Surveillance System (PedNSS) Data, 2009.Accessed online at www.dhcs.ca.gov/services/chdp/Pages/PedNSS2009.aspx (accessed 9/30/10).
Customize chart with PedNSS data from your county. See User Guide.
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Childhood Overweight and Obesityby Ethnicity
California 2009 [Insert Your County Name]
20.5
17.9
17.7
21.2
19.5
25.2
20.1
26.2
14.1
13.5
21.0
35.5
14.6
18.9
01020304050
% o
verw
eigh
t or
obes
e
≥ 95th %ile 85th - < 95th %ile
CDC Pediatric Nutrition Surveillance System (PedNSS) Data, 2009.Accessed online at www.dhcs.ca.gov/services/chdp/Pages/PedNSS2009.aspx (accessed 9/30/10).
Children Aged 5 to < 20 years
Customize chart with PedNSS data from your county. See User Guide.
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What Is Body Mass Index?• A number that compares an individual’s weight to height
• Body Mass Index (BMI) = Weight (kg) / Height (m)²
• As an indirect measure, a screening test for body fatness
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• Lifetime tracking tool– Age 2 years through adulthood
• Examines weight, stature and age• Screening for health and nutrition status• Early indicator of other health risk factors
– Hyperlipidemia– Elevated insulin– High blood pressure
Why Use BMI-for-Age?
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Body Mass Index-for-Agefor Children and Teens
• Recommended by– Centers for Disease Control– American Academy of Pediatrics– Expert Committee– USPSTF– White House Task Force
• Required by– CHDP– Health Plans
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Body Mass IndexCutoff Values for Adults
• Standard weight categories• Same for all ages• Same for men and women
Weight Status BMI
Obese 30.0 and above
Overweight 25.0 - 29.9
Normal 18.5 - 24.9
Underweight Below 18.5
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Age 2 4 9 13BMI Value 19.3 17.8 21.0 25.1
For Children, BMI Changes with AgeExample: Child’s growth tracking along 95th percentile
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BMI for Children and Teens• Age- and sex-specific• Plot BMI on growth chart to find percentile• Weight status determined by percentile
Weight Status Category Percentile Range
Obese ≥ 95th percentile
Overweight 85th to < 95th percentile
Normal 5th to < 85th percentile
Underweight < 5th percentile
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What is a Percentile?
95th
5th
Major Percentile Divisions
85th
50th
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Tip: Download and print fromwww.cdc.gov/growthcharts/
Formula to calculate BMI
Published May 30, 2000 (modified 2000-2001)
Percentile lines5th - 10th - 25th - 50th
75th - 85th - 90th - 95th
CDCGrowth Charts
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How to Read and Interpretthe Growth Chart
• A single point on the curve indicates current status
• A series of BMI plots are needed to determine the growth trend
• If growth deviates from the expected growth pattern, further assessment may be needed
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Adiposity Rebound
• The increase in BMI that occurs after it reaches its lowest point, usually between ages 4 to 6
• Normal growth pattern
↑BMI
AGE →
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Adiposity ReboundChild following 10th percentile curve
At what age does the BMI reach its lowest point?
↑BMI
AGE →
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Adiposity ReboundChild following 85th percentile curve
At what age does the BMI reach its lowest point?
↑BMI
AGE →
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Early Adiposity Rebound
• Early adiposity rebound(before age 5) is related to higher BMI in adulthood
• An increase in BMI percentile < 5 yearsis a red flag
↑BMI
AGE →
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Early Adiposity ReboundWithout Intervention With Intervention
↑BMI ↑BMI
AGE → AGE →
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Excessive Adiposity Rebound
• Excessive adiposity rebound is related to higher BMI in adulthood
• Increasing BMI percentiles crossing major percentile linesare red flags
↑BMI
AGE →
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Steps to Plot BMI-for-age
1. Select appropriate growth chart
2. Measure standing height accurately
3. Measure weight accurately
4. Determine BMI value
5. Determine BMI-for-age percentile
6. Record BMI percentile on PM 160
7. Determine weight category
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Chart Carlos Correctly Step 1:
Select Appropriate Growth Chart • Birth to 36 months: Boys or Girls
– Length-for-age– Weight-for-age– Head circumference– Weight-for-length
• 2 to 20 years: Boys or Girls– Stature-for-age– Weight-for-age– BMI-for-age
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4 5 3
Date Age Weight Stature BMI*
3 32 # 38 ½ ”
15.2
4 36 # 41 ” 15.0
6 45 ¾ ”
Chart Carlos CorrectlyStep 2: Measure Standing Height
Record on growth chart and PM 160
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Chart Carlos CorrectlyStep 3: Measure Weight
Record on growth chart and PM 160
4 5 3 0 4 3 0 8
Date Age Weight Stature BMI*
3 32 # 38 ½ ”
15.2
4 36 # 41 ” 15.0
6 43 ½ #
45 ¾ ”
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• English measurementsWt (pounds) ÷ Ht (inches) ÷ Ht (inches) x 703
• Metric measurementsWt (kg) ÷ Ht (cm) ÷ Ht (cm) x 10,000
TIP: Formulas are listed on the BMI-for-age chart
Method 1:
Using a calculator
Chart Carlos Correctly Step 4A: Determine BMI Value
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• Find height on inner wheelTIP: Mark with your thumb and index finger
• Line up the height with weight on outer wheel• Read BMI value in the window on the inner wheel
TIP: Read decimal points from right to left!
Method 2:Using aBMI calculation wheel
Chart Carlos CorrectlyStep 4A:Determine BMI Value
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Date Age Weight Stature BMI*
3 32 # 38 ½ ”
15.2
4 36 # 41 ” 15.0
6 43 ½ #
45 ¾ ”
14.6
Chart Carlos Correctly Step 4B: Determine BMI Value
Record on growth chart
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• Find age on horizontal axis
• Find BMI valueon vertical axis
• Mark point of intersection
• Estimate BMI percentile
TIP: Use a transparentgrowth chart plotting aid
Chart Carlos CorrectlyStep 5: Determine BMI-for-Age %ile
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• Estimate a whole number between 1 and 99 that best represents the percentile point plotted on the growth chart
4 5 3 0 4 3 0 82 5
Chart Carlos CorrectlyStep 6:
Record BMI Percentile on PM 160
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Weight Status Category Percentile Range
Obese ≥ 95th percentile
Overweight 85th to < 95th percentile
Normal 5th to < 85th percentile
Underweight < 5th percentile
Chart Carlos CorrectlyStep 7A:
Determine Weight Category
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• On PM 160, enterfollow up code in appropriate column under “PROBLEM SUSPECTED”
• Enter diagnosis under “COMMENTS/PROBLEMS” – Underweight– Overweight– Obese
Chart Carlos CorrectlyStep 7B: Record Abnormal Results
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BMI for 5 year old boy•Weight: 43.5 lb •Height: 43.0 in•BMI= 16.5
• BMI-for-age =75-84th percentile
• Normal range
If height is inaccurate:•Weight: 43.5 lb •Height: 42.5 in•BMI = 17.0
• BMI-for-age = 85-94th percentile
• Overweight range
Accurate Measurements Are Critical
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Summary
You are now able to:• describe the use of BMI as a screening tool• determine BMI value• plot BMI value on the growth chart• determine BMI-for-age percentile• interpret weight category• record results on PM 160
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Color-coded BMI Charts
• 5210 Let’s Go!www.letsgo.org/
• Eat Smart, Move MoreNorth Carolinawww.eatsmartmovemorenc.com/
• National Initiativefor Children’s Healthcare Qualitywww.nichq.org/ > Childhood Obesity
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Growth Assessment Resources
• Essential clinical tools in training packet• Resource handout lists sources for
– Online tutorials– Online resources– Growth charts– Plotting aids– BMI calculators and wheels
CDC BMI Percentile Calculator for Child and TeenCHOP Body Mass Index and Z-Score Calculation in ChildrenShape Up America! Childhood Obesity Assessment Calculator
– Software applications
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References• American Academy of Pediatrics Policy Statement:
Prevention of Pediatric Overweight and Obesity. Pediatrics. 112: 424-430, 2003. http://aappolicy.aappublications.org/cgi/content/full/pediatrics;112/2/424
• Assessment of Child and Adolescent Overweight and Obesity.Pediatrics 120: S193-S228, 2007. http://pediatrics.aappublications.org/cgi/content/full/120/Supplement_4/S193
• Expert Committee Recommendations Regarding the Prevention, Assessment,and Treatment of Child and Adolescent Overweight and Obesity: Summary Report. Pediatrics 120 : S164-S192, 2007.http://pediatrics.aappublications.org/cgi/content/abstract/120/Supplement_4/S164
• Recommendations for Prevention of Childhood Obesity.Pediatrics 120 : S229-S253, 2007.http://pediatrics.aappublications.org/cgi/content/abstract/120/Supplement_4/S229
• The Validity of BMI as an Indicator of Body Fatness and Risk Among Children. Pediatrics 124: S23-S34, 2009. http://pediatrics.aappublications.org/cgi/content/abstract/124/Supplement_1/S23