Table 3.

Multivariate analysis of risk factors for developing SSI

Variable	Effect size (95 % CI)	p value
Male gender	3.42 (1.12–10.4)	0.03
Age (years)	1.01 (0.96–1.05)	0.82
BMI	1.09 (1.00–1.19)	0.04
Active smoker	1.70 (0.40–7.25)	0.47
Diabetes	1.36 (0.20–9.11)	0.76
Surgery for cancer	0.53 (0.17–1.80)	0.32
Operation time (minutes)	1.00 (1.00–1.01)	0.80
Conversion to open approach	5.21 (1.75–15.63)	0.003
Use of CO2 conditioner	0.34 (0.12–0.95)	0.04

BMI body mass index, CO ₂ carbon dioxide, CI confidence interval