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Figure 1 Death or myocardial infarction-free survival by Duke Activity Status Index measurements of metabolic equivalents (METs), using Bruce protocol stage cutpoints (n = 914). Five-year survival corresponds to 95%, 92%, 88%, and 85% for >9.9, 7.5 to 9.9, 4.8 to 7.4, and 1 to 4.7 METs, respectively (p = 0.009).