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Figure 4 The frequency of an abnormal myocardial perfusion single-photon emission computed tomography (MPS) study according to coronary artery calcium (CAC) percent ranking and absolute CAC score (patients with percentile rankings <50% are not shown owing to the very low frequency of abnormal MPS studies in such patients). Within each of three CAC percentile groups, patients are further divided on the basis of their absolute CAC score, condensed into three subgroups: CAC scores of 1 to 99, 100 to 399, and 400. The first set of numbers below each bar represents the absolute CAC score; the second set represents the mean age ± SD; and the third set represents the number of patients within each of the nine subgroups that are illustrated. Note that regardless of percentile ranking, the frequency of an ischemic MPS study was relatively high when the absolute CAC score was 400, and relatively low when the CAC score was <100.