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Kaplan-Meier analyses showing the composite outcome of death, stroke, and myocardial infarction for patients aged 75 years or younger (n=1,133) and older than 75 years (n=432). At 12 months, the event rates were 4.3% vs 10.0%, respectively (P=.001). Difference in event rates between symptomatic and asymptomatic patients and between age strata was tested assuming normality of the estimated even rates for both groups using a standard linear contrast.
