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Table 3 Analyses of primary and secondary outcome variables before propensity score matching

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

Variable

Metformin (n = 635) 49.5%

Non-metformin (n = 648) 50.4%

p value

Overall (CABG or valve surgery)

 New atrial fibrillation

149 (23.5%)

172 (26.5%)

0.2088

 Acute renal failure

This is defined as 3-fold increase in creatinine from baseline on admission)

3 (0.5%)

5 (0.8%)

0.7258

 30-day readmission with arrhythmia

4 (0.6%)

3 (0.5%)

0.7232

CABG only

N = 408

N = 405

 

 New atrial fibrillation

81 (19.9%)

91 (22.5%)

0.3707

 Acute renal failure

0 (0.0%)

2 (0.5%)

0.2479

 30-day readmission with arrhythmia

2 (0.5%)

2 (0.5%)

0.9999

Valve surgery only

N = 143

N = 142

 

 New atrial fibrillation

38 (26.6%)

39 (27.5%)

0.8655

 Acute renal failure

2 (1.4%)

0 (0.0%)

0.4982

 30-day readmission with arrhythmia

1 (0.7%)

0 (0.0%)

0.9999