Over the years many additional studies were added. The Lipoprotein Phenotyping Study examined which fraction or fractions of high density lipoproteins or low density lipoproteins were related to increased risk for coronary heart disease. The Black-White Neonatal Blood Pressure Study related blood pressure levels during the first year of life to the subsequent development of hypertension and comparing similar groups in other geographical areas to the Evans County group. The Contraceptive Steroids on Blood Pressure Study, funded by the National Institute of Child Health and Human Development, related antecedent characteristics to the development of hypertension or thrombotic disease in the first time oral contraceptive user. The Evans County Health Department also participated Hypertension Detection and Followup Program clinical trial and continued surveillance of the cohort.