Data came from the National Health and Nutrition Examination Surveys (NHANES), a series of repeated cross-sectional surveys conducted by the U.S. Centers for Disease Control and Prevention. The investigators used data from NHANES III (1988-1994) and 5 pooled survey cycles from the continuous NHANES (2005-2014) to represent the two survey periods under study over 20 years apart. These analyses were restricted to Mexican-Americans and non-Hispanic White children aged 4-17 years. Out of the 12,006 Mexican-Americans and white children who attended the clinical examination in NHANES III and the continuous NHANES (2005-2014), those who reported being pregnant were excluded from analyses (N=19). Our final analytic sample included 6,280 Mexican-Americans and 5,707 White children across the two survey periods (2,704 Mexican-Americans and 2,014 White children in 1988-1994; 3,576 Mexican-Americans and 3,693 White children in 2005-2014)