High Body Mass Index for Age Among US Children and Adolescents, 2003-2006
This study aims to estimate the prevalence of 3 measures of high body mass index (BMI) for age and to examine recent trends for US children and adolescents using national data with measured heights and weights. Height and weight measurements were obtained from 8165 children and adolescents as part of the 2003-2004 and 2005-2006 National Health and Nutrition Examination Survey (NHANES), nationally representative surveys of the US civilian, noninstitutionalized population. The main outcome measures were the prevalence of BMI for age at or above the 97th percentile, at or above the 95th percentile, and at or above the 85th percentile of the 2000 sex-specific Centers for Disease Control and Prevention (CDC) BMI-for-age growth charts among US children by age, sex, and racial/ethnic group. As no statistically significant differences in the prevalence of high BMI for age were found between estimates for 2003-2004 and 2005-2006, data for the 4 years were combined to provide more stable estimates for the most recent time period. Overall, in 2003-2006, 11.3% of children and adolescents aged 2-19 years were at or above the 97th percentile of the 2000 BMI-for-age growth charts, 16.3% were at or above the 95th percentile, and 31.9% were at or above the 85th percentile. Prevalence estimates varied by age and by racial/ethnic group. Analyses of the trends in high BMI for age showed no statistically significant trend over the 4 time periods (1999-2000, 2001-2002, 2003-2004, and 2005-2006) for either boys or girls.