There was a cross-sectional study and a short-term longitudinal study linking baseline data with morbidity based on sickness-absence records collected over an eighteen month period. Each subject was screened in an on-site work clinic. Questions were included on birthdate, civil service grade, marital status, family history of cardiovascular disease, occupation, car and house ownership, ethnicity, medical history of cardiovascular and respiratory problems, smoking, coffee and alcohol use, dietary intake, physical activity, work characteristics, social support, life satisfaction, life events, and mental illness. Type A behavior was assessed by the Framingham Type A Scale. A separately funded physical exam was conducted and included data on blood pressure, height, weight, pulse, ECG, blood clotting factors, and serum cholesterol. Initial analysis included calculation of prevalence rates of ischemic heart disease by age, sex, and social class as measured by employment grade. Dependent variables were crosstabulated for various categories of independent variables. The independent variables consisted of measures of psychosocial stress arising from work and personal situations.