Racial and ethnic differences in secular trends for childhood BMI, weight, and height.
OBJECTIVE
The prevalence of childhood overweight in the United States has markedly increased over the last 30 years. We examined differences in the secular trends for BMI, weight, and height among white, black, and Mexican-American children.


METHODS
Analyses were based on nationally representative data collected from 2 to 17 year olds in four examinations (1971-1974 through 1999-2002).


RESULTS
Overall, black children experienced much larger secular increases in BMI, weight, and height than did white children. For example, over the 30-year period, the prevalence of overweight increased approximately 3-fold (4% to 13%) among 6- to 11-year-old white children but 5-fold (4% to 20%) among black children. In most sex-age groups, Mexican-American children experienced increases in BMI and overweight that were between those experienced by blacks and whites. Race/ethnicity differences were less marked among 2 to 5 year olds, and in this age group, white children experienced the largest increase in overweight (from 4% to 9%). In 1999-2002, the prevalence of extreme BMI levels (> or =99th percentile) reached 6% to 7% among black girls and Mexican-American boys.


CONCLUSIONS
Because of the strong tracking of childhood BMI levels into adulthood, it is likely that the secular increases in childhood overweight will greatly increase the burden of adult disease. The further development of obesity interventions in different racial/ethnic groups should be emphasized.
Freedman
David S
DS
Division of Nutrition and Physical Activity, Centers for Disease Control and Prevention, Atlanta, Georgia, USA. DFreedman@CDC.gov
Khan
Laura Kettel
LK
Serdula
Mary K
MK
Ogden
Cynthia L
CL
Dietz
William H
WH
D000293:Adolescent; D001741:Black or African American / Q000706:statistics & numerical data; D000367:Age Factors; D001827:Body Height / Q000502:physiology; D015992:Body Mass Index; D001835:Body Weight / Q000502:physiology; D002648:Child; D015362:Child Nutrition Disorders / Q000453:epidemiology*; D002675:Child, Preschool; D002908:Chronic Disease; D005006:Ethnicity / Q000706:statistics & numerical data*; D005260:Female; D006630:Hispanic or Latino / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D017058:Mexican Americans / Q000706:statistics & numerical data; D009749:Nutrition Surveys; D009765:Obesity / Q000453:epidemiology*; D012307:Risk Factors; D012737:Sex Factors; D014481:United States / Q000453:epidemiology; D044465:White People / Q000706:statistics & numerical data