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      Body fat percentile curves for U.S. children and adolescents.

      American Journal of Preventive Medicine
      Adipose Tissue, Adolescent, Age Distribution, Age Factors, Body Height, Body Mass Index, Body Weight, Child, Child, Preschool, Cross-Sectional Studies, Female, Growth Charts, Humans, Likelihood Functions, Male, Nutrition Surveys, Obesity, diagnosis, Population Surveillance, Reference Values, Regression Analysis, Sex Factors, Skinfold Thickness

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          Abstract

          To date, several studies have been published outlining reference percentiles for BMI in children and adolescents. In contrast, there are limited reference data on percent body fat (%BF) in U.S. youth. The purpose of this study was to derive smoothed percentile curves for %BF in a nationally representative sample of U.S. children and adolescents. Percent fat was derived from the skinfold thicknesses of those aged 5-18 years from three cross-sectional waves of the National Health and Nutrition Examination Survey (NHANES) IV (1999-2000, 2001-2002, and 2003-2004; N=8269). The LMS (L=skewness, M=median, and S=coefficient of variation) regression method was used to create age- and gender-specific smoothed percentile curves of %BF. Growth curves are similar between boys and girls until age 9 years. However, whereas %BF peaks for boys at about age 11 years, it continues to increase for girls throughout adolescence. Median %BF at age 18 years is 17.0% and 27.8% for boys and girls, respectively. Growth charts and LMS values based on a nationally representative sample of U.S. children and adolescents are provided so that future research can identify appropriate cut-off values based on health-related outcomes. These percentiles are based on skinfolds, which are widely available and commonly used. Using %BF instead of BMI may offer additional information in epidemiologic research, fitness assessment, and clinical settings. Copyright © 2011 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.

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