Relative risk for CHD or CVD in 7 physical fitness and 16 physical activity cohorts cited in the Report of the Surgeon General [57]. Sample percentages sorted from least to most fit or active, with the lowest category used as the referent. Several studies report CHD in addition to CVD endpoints (relative risk in order of lowest to highest percentage): Framingham Men [22] (1.00, 0.69, 0.60); Harvard Alumni Study [37] (1.00, 0.82, 0.64); LRC Mortality Follow-up Study [36] (1.00, 0.54, 0.54, 0.15); and U.S. Railroad study cohorts [52] for fitness (1.00, 0.88, 0.66, 0.69) and activity (1.00, 0.84, 0.74, 0.80).