propensity score article 4 23 2 Aged 2 BITA 2 CABG 2 CI 2 Chi-Square Distribution 2 Coronary Artery Bypass, Off-Pump 2 Disease-Free Survival 2 European System for Cardiac Operative Risk Evaluation 2 Female 2 Follow-Up Studies 2 HR 2 Humans 2 IQR 2 ITA 2 Internal Mammary-Coronary Artery Anastomosis 2 Kaplan-Meier Estimate 2 LAD 2 LITA 2 Logistic Models 2 Male 2 Middle Aged 2 Multivariate Analysis 2 OPCAB 2 OR 2 Odds Ratio 2 Patient Readmission 2 Postoperative Complications 2