Baseline clinical variables were compared between groups using t test and analysis of variance or Mann-Whitney nonparametric test when the frequency distribution was skewed (continuous variables). Categorical variables were compared using χ2 test. Event-free survival was estimated by the Kaplan-Meier survival function. The log-rank test was used to assess differences between groups, and a Cox proportional hazard regression model was used to identify independent predictors of repeat revascularization, MACE, and MACCE. Results are reported as hazard ratios (HRs) together with associated 95% CIs. P < .05 was considered statistically significant. In univariate analysis, we considered the following variables as potential prognostic factors: age, sex, BMI, clinical presentation (ie, stable angina, non-ST-segment elevation acute coronary syndromes, ST-segment elevation myocardial infarction), smoking, hypertension, type 2 diabetes, dyslipidemia, history of myocardial infarction, cerebrovascular disease, peripheral arterial disease, renal failure, heart failure (left ventricular ejection fraction ≤ 40%), extent of diseased or treated vessel, PCI type (ie, emergency vs elective), adjunctive medical therapy (ie, aspirin, thienopyridine, β-blockers, statins, angiotensin-converting enzyme inhibitor/angiotensin receptor blockers [ACE-I/ARBs]), and OSA group (ie, CPAP+/AHI > 15, CPAP−/AHI ≥ 15, CPAP−/AHI 5-14.9). Variables with a significant unadjusted association with cardiovascular events were entered into a forward stepwise Cox model after forcing the entry of group as a variable. The P-to-enter value had to be < .05 and the P-to-remove value > .1. Statistical analyses were performed with SPSS version 18.0 software (IBM).