The sample was predominantly non-Hispanic white (63%) and African American (27%) with nearly equal representation of boys (49%) and girls (51%). Mean age was 11.4 (SD = .9), at enrollment, with 10% in grade 4, 49% in grade 5, 26% in grade 6, and the rest (15%) in grade 7. Sixty-six percent of participants lived in households with married parents. Average household size was 4 individuals. Median years of parental education were 14. Hollingshead’s Two-Factor Index of Social Status (reversed scored) (Hollingshead & Redlich, 1958, 2007) was 47.0 ± 15.8 corresponding to the lower range of middle-class.
