Table 2.

Multivariate logistic regression analysis of risk factors for postoperative SSI following elective surgery in elderly patients

Variables	OR and 95% CI	P value
Diabetic mellitus	3.7 (1.7‐5.6)	0.002
BMI (kg/m2)
18.5 to 23.9	Reference
<18.5	1.3 (0.8‐1.7)	0.421
24.0 to 27.9	1.1 (0.9‐1.3)	0.714
28.0 to 31.9	1.8 (0.9‐2.7)	0.083
≥32.0	2.6 (1.3‐3.9)	0.004
Current smoking	4.2 (2.1‐6.4)	<0.001
Surgical duration > 75th percentile	1.9 (1.0‐2.9)	0.044
ALB (<35 g/L)	2.3 (1.3‐3.4)	0.027

Abbreviation: ALB, albumin, BMI, body mass index; OR, odd ratio.