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Figure 1 Kaplan-Meier survival curves of the elderly population based on risk groups classified by the Duke treadmill score. (A) Cardiac survival; (B) Survival free of cardiac death or nonfatal myocardial infarction (MI); (C) Survival free of cardiac death or nonfatal MI or late revascularization. Numbers below abscissa = numbers of patients available for analysis at each time point (see text for details). The number of high risk patients is small, which makes the estimates for this subgroup less reliable. Short-dashed lines = low risk; solid lines = intermediate risk; long-dashed lines = high risk.
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