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CAPP2: Time to first colorectal cancer in those randomized to aspirin compared with those randomized to the aspirin placebo. In each case, Kaplan-Meier analysis was restricted to participants who had taken ≥ 2 years’ intervention and the analysis was adjusted for gender (hazard ratio 0.41 (95% confidence interval, 0.19–0·86), P = 0·02). Each point on the plot shows the estimated cumulative incidence by years of follow-up, together with the corresponding 95% confidence interval.
