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Kaplan-Meier plots of the cumulative probability of reoperation for glaucoma in the Tube Versus Trabeculectomy Study after randomized treatment. Tube reoperation rate at 1 year = 1% (n = 101), 2 years = 3% (n = 90); 3 years = 5% (n = 79), 4 years = 9% (n = 67), 5 years = 9% (n = 42). Trabeculectomy reoperation rate at 1 year = 6% (n = 90), 2 years = 13% (n = 74); 3 years = 14% (n = 71), 4 years = 16% (n = 66), 5 years = 29% (n = 39).
