The sample was composed of 12,866 men who at the time of study entry were in the top 15 percent of a risk score distribution based on the Framingham Heart Study data, but had no clinical evidence of CHD. During the trial, annual measurements were taken, which included some health behaviors, stressful life events, feelings of anger and hostility. A subset of 3,110 men also were administered once the Type A Structured Interview from which Potential for Hostility could be rated and all men who survived until the sixth year of the trial were administered the CES-Depression scale.