Table 3. Univariate analysis by logistic and linear regression of preoperative and intraoperative variables, according to presence of postoperative infection or length of hospital stay (LOS).

Postoperative infection	Odds ratio	95% CI	p
Sex (male)	0.45	0.10 - 1.92	0.28
Age (> 50 years)	1.66	0.41 - 6.81	0.48
Nutritional status (malnutrition)	3.00	0.67 - 13.4	0.15
ASA (> 2)	1.96	0.38 - 10.16	0.41
NNIS (> 1)	6.60	1.40 - 31.05	0.01
Clinical diagnosis (cancer)	1.29	0.31 - 5.33	0.72
Length of hospital stay (LOS)	β	95% CI	p
Sex (male)	−6.45	−16.92 - 4.02	0.22
Age (> 50 years)	−4.92	−11.13 - 10.14	0.92
Nutritional status (malnutrition)	10.56	−0.40 - 20.73	0.04
ASA (> 2)	0.91	−11.27 - 13.10	0.88
NNIS (> 1)	9.65	−0.29 - 19.60	0.06
Clinical diagnosis (cancer)	11.11	1.20 - 21.03	0.03

CI = confidence interval; ASA = American Society of Anesthesiologists score, NNIS = National Nosocomial Infection Surveillance score.