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Figure 4 Kaplan-Meier estimates of the event-free survival at one year (death, myocardial infarction, or target vessel revascularization) according to treatment group. No differences were found between the two groups in the entire 450-patient population (Cox hazard ratio 0.81, 95% confidence interval [CI] 0.56 to 1.17) (A), but the event-free survival in patients with large vessels (3 mm) (B) was significantly greater in the stent group (Cox hazard ratio 0.31, 95% CI 0.2 to 0.73). This difference was due to the lower proportion of patients in the stent group that required target vessel revascularization. Note survival scales cut off at 60%. BA = balloon angioplasty; ST = stent.