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Table 4 Analyses of primary and secondary outcome variables after propensity score matching

From: Metformin therapy and postoperative atrial fibrillation in diabetic patients after cardiac surgery

Variable Metformin (n = 114) % Non-metformin (n = 114) % p value
Overall (CABG or valve surgery)
 New atrial fibrillation 30 (26.3%) 35 (30.7%) 0.4658
 Acute renal failure 1 (0.9%) 0 (0.0%) NA
 30-day readmission with arrhythmia 0 (0.0%) 1 (0.9%) NA
CABG only N = 85 N = 85  
 New atrial fibrillation 18 (21.2%) 24 (28.4%) 0.2733
 Acute renal failure 1 (1.2%) 0 (0.0%) NA
 30-day readmission with arrhythmia 0 (0.0%) 1 (1.2%) NA
Valve surgery only N = 57 N = 57  
 New atrial fibrillation 19 (33.3%) 22 (38.6%) 0.5775
 Acute renal failure 0 (0.0%) 0 (0.0%) NA
 30-day readmission with arrhythmia 0 (0.0%) 0 (0.0%) NA