Table 1. Preoperative variables in the non-PRP and PRP groups.

Preoperative variable	non-PRP (n = 305)	PRP (n = 305)	Standardized mean differences	P-value
Age	49.95±11.96	49.78±10.53	1.57%	0.846
Sex	240 (78.69%)	237 (77.70%)	2.38%	0.769
BMI	26.37±4.53	26.06±4.45	6.92%	0.393
Current smoker	119 (39.02%)	115 (37.70%)	2.69%	0.740
Alcohol consumption	89 (29.18%)	98 (32.13%)	6.39%	0.430
Diabetes	9 (2.95%)	6 (1.97%)	6.34%	0.434
Hypertension	198 (64.92%)	194 (63.61%)	2.69%	0.740
Previous cardiac surgery	8 (2.62%)	8 (2.62%)	0	1
COPD	18 (5.90%)	21 (6.89%)	4.01%	0.620
Liver diseases	1 (0.33%)	1 (0.33%)	0	1
Kidney diseases	7 (2.30%)	9 (2.95%)	4.10%	0.613