The cumulative incidence of an arterial event was 1.5% (95% CI, 0.57%-3.99%; 192 patients at risk) at 5 years, 4.1% (95% CI, 2.14% to 7.83%; 120 patients) at 10 years, 12.8% (95% CI, 7.15% to 22.26%; 23 patients) at 20 years, and 22.1% (95% CI, 12.0% to 40.9%; 7 patients) at 25 years. Mean (± SD) at 25 years is shown on the figure.