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Figure 3 The association between the mortality rate for patients with an initial negative troponin test (within 6 h of presentation) and the proportion of patients in each study with electrocardiogram (ECG) evidence of ischemia. The higher risk cohorts (more ECG ischemia) had a higher mortality rate. Evidence of ischemia was defined separately for each trial but usually consisted of ST depression or transient ST elevation. Data from patients with persistent ST elevation are not included. Squares = negative TnI (troponin I); circles = negative TnT (troponin T).