A method for calculating BMI z-scores and percentiles above the 95th percentile of the CDC growth charts

Details

• Alternative Title:
  Ann Hum Biol
• Personal Author:
  Wei, Rong ; Ogden, Cynthia L. ; Parsons, Van L. ; Freedman, David S. ; Hales, Craig M.
• Description:
  Background:
  
  The 2000 CDC growth charts are based on national data collected between 1963 and 1994 and include a set of selected percentiles between the 3rd and 97th and LMS parameters that can be used to obtain other percentiles and associated z-scores. Obesity is defined as a sex- and age-specific body mass index (BMI) at or above the 95th percentile. Extrapolating beyond the 97th percentile is not recommended and leads to compressed z-score values.
  
  Aim:
  
  This study attempts to overcome this limitation by constructing a new method for calculating BMI distributions above the 95th percentile using an extended reference population.
  
  Subjects and methods:
  
  Data from youth at or above the 95th percentile of BMI-for-age in national surveys between 1963 and 2016 were modelled as half-normal distributions. Scale parameters for these distributions were estimated at each sex-specific 6-month age-interval, from 24 to 239months, and then smoothed as a function of age using regression procedures.
  
  Results:
  
  The modelled distributions above the 95th percentile can be used to calculate percentiles and non-compressed z-scores for extreme BMI values among youth.
  
  Conclusion:
  
  This method can be used, in conjunction with the current CDC BMI-for-age growth charts, to track extreme values of BMI among youth.
  
  
• Subjects:
  Adolescent Anthropometry Body Mass Index Centers For Disease Control And Prevention, U.S. Child Child, Preschool Female Growth Charts Humans Male United States

  More +
• Keywords:
  Body Mass Index Childhood Obesity Growth Percentiles Half Normal Distribution
• Source:
  Ann Hum Biol. 47(6):514-521
• Pubmed ID:
  32901504
• Pubmed Central ID:
  PMC11232929
• Document Type:
  Journal Article
• Funding:
  CC999999/ImCDC/Intramural CDC HHSUnited States/
• Volume:
  47
• Issue:
  6
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha-512:80989d363d99dc25dccf537d8dc694340cd6dfaeaf2434b7ce708cd4da2ece93e963a8f2439ae235b953a906fd87e7ef5a80a0458fd09086694da66cf67082e6
• Download URL:
  https://stacks.cdc.gov/view/cdc/158532/cdc_158532_DS1.pdf
• File Type:
  [PDF - 394.69 KB ]