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Figure 1 Kaplan-Meier mortality curves for patients with normal versus abnormal microvolt T-wave alternans (MTWA) test results. In two years of follow-up, only 4 events occurred in the 189 patients with a normal MTWA test; 47 events occurred in the group with an abnormal MTWA test. Abnormal MTWA tests comprise positive tests (n = 162, two-year event rate 12.3%) and indeterminate tests (n = 198, two-year event rate 17.5%).