The investigators conducted a secondary analysis of the Sex Hormones and Lipoproteins in Adolescent Males Study (HD/HL18281), a 3-year (1984-1987) study of lipids, blood pressure, weight, fat patterning, and sex steroid hormones (SSH) in adolescent males. A total of 664 black and white males, ages 10-15, were enrolled into a study designed as a series of repeated data collections over two years within age cohorts. Cross-sectional analyses were used to explain differences during adolescence in sex steroid hormones and sex steroid hormone-lipid relationships between black and white boys and between boys with and without a family history of coronary heart disease.. When the data were originally collected for this study, theoretical models of flexible longitudinal analytic techniques had been developed, but were not available for computer use. These techniques, now supported by software, allow a more powerful and complete analysis of these data.