The study was renewed in 1996 to continue the longitudinal study of children (a biracial population, ages 6-16 years) for whom influences of hormones on blood pressure are being examined. Twice yearly the children have had blood pressure and anthropometrics measured, and overnight urine samples collected for measurement of aldosterone, adrenal androgens (AA), luteinizing hormone (LH), sodium, potassium, and creatinine. Rates of growth and the changes in blood pressure with age have been well characterized for this population. From the original observations, several differences were observed between racial groups; specifically, Black children were found to consume less potassium, produce about 40 percent less aldosterone and have higher blood pressures than white children. It was observed that children with positive families histories of hypertension were more likely to have lower aldosterone-excretion rates.