Results Intention-to-treat analysis included 273 patients (137 received esomeprazole and 136 received placebo). Recurrent ulcer bleeding occurred in none receiving esomeprazole and 8 patients receiving placebo. The 12-month cumulative incidence of recurrent bleeding was 0% in the esomeprazole group and 8.9% in the placebo group (difference, 8.9 percentage points; 95% confidence interval for the difference, 4.1 to 13.7; P=0.0004). During follow-up, 16.1% of patients in the esomeprazole group and 15.4% in the placebo group used low-dose aspirin. Among patients who did not use aspirin, the cumulative incidence of recurrent ulcer bleeding was 0% in the esomeprazole group and 7.1% in the placebo group (difference, 7.1 percentage points; 95% confidence interval, 2.4 to 11.8; P=0.004).