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Kaplan–Meier survival curves for surgical success. Continuous line: complete success (IOP = 5–20 mmHg and ΔIOP ≥ 20% without additional anti-glaucoma medications). Broken line: qualified success (IOP = 5–20 mmHg and ΔIOP ≥ 20% with additional anti-glaucoma medications). IOP = intraocular pressure.
