Consider the follow-up study data from the Evans County (Georgia) Heart Disease Study described by Cassels (1971). The data pertain to a cohort of 609 healthy white males between the ages of 40 and 76 who were residents of Evans County in 1960. The cohort was followed for 7 years, after which new cases of coronary heart disease (CHD) were identified. The level of circulating catecholamine (CAT) is the exposure variable of interest (defined as 1 = high and 0 = normal). The purpose of the study was to assess the putative association between CAT (as measured in 1960) and the subsequent 7-year incidence of CHD controlling for other potential confounders.

Given the estimated odds of CHD for a 50-year-old smoker with a high catecholamine level, a cholesterol level of 210 mg/dl, an abnormal electrocardiogram, a DBP of 100 mm Hg, and a SBP of 140 mm Hg is 0.475, what is the corresponding risk of CHD?

\f