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To identify factors determining early saphenous vein aortocoronary bypass occlusion, we analyzed the data base of the GESIC study, a trial comparing antiplalelel drug regimens that included 927 patients with 1,854 saphenous vein grafts. The univariate analysis showed female sex (p < 0.0097), obesity (p < 0.001), rest angina (p < 0.0026), history of congestive heart failure (p < 0.037),...