The design was both cross-sectional and longitudinal. Between 1971 and 1986, over 13,000 school age children from 5 to 18 years of age were screened for coronary risk factors. Measurements were made of serum cholesterol, serum triglycerides, blood pressure, height, weight, and skinfold thickness. Beginning in 1980 the graduates of the Muscatine schools who had participated in earlier screens were recruited at ages 23, 28, 33, and 38 years to have their risk factors re-assessed. The oldest graduates were 38 years of age by 1991. The total number of adults was 5,126.