A case cohort study was built for the investigation of non-standard risk markers after 4 years of follow-up. It comprised 198 subjects who experienced a first CHD event during the 4 years of follow up and a sub-cohort of 1,081 subjects randomly selected from the initial cohort in strata defined by center, age (5-year intervals) and gender. These subjects had all lipid measures available and had no personal history of CHD at baseline. Apolipoprotein A-I (ApoA), apolipoprotein B-100 (ApoB) and high-sensitivity CRP (hs-CRP) were centrally measured in thawed baseline plasma by technicians blind to CHD status using a particle-enhanced turbidimetric immunoassay. CHD events were surveyed during intermediate examinations at the study center two and four years after baseline examination, were the subjects were interviewed about the occurrence of any hospitalizations for a CHD event including stable and unstable angina pectoris, coronary balloon dilatation, or artery bypass, myocardial infarction, and death due to CHD. For all event reported, a detailed enquiry was made by trained physicians through hospital charts, interview with the patient's physician or the family, and in case of a fatal event, death certificates, and autopsy reports. Events were finally adjudicated by an independent event validation committee.