Table 4.

Factors associated with postoperative COVID 19 infection. Unadjusted and adjusted logistic regression

Variable	Unadjusted		Adjusted
n = 1298	OR (95% CI)	p value	OR (95% CI)	p value
Hospital stay (days)	1.07 (1.04–1.11)	< 0.001	1.08 (1.04–1.11)	< 0.001
Clavien-Dindo
0–II	1
III–IV–V	3.79 (0.81–17.66)	0.090
Operative time (min)	1.004 (1.001–1.008)	0.023
Blood transfusion
No	1
Yes	5.44 (0.67–44.09)	0.112
ICU stay
No	1
Yes	7.70 (2.03–29.28)	0.003
Readmission
No	1		1
Yes	9.56 (2.50–36,56)	0.001	9.02 (2.30–35.48)	0.002
Month of surgery (2020)
May	1
June	0.71 (0.17–3.06)	0.650
July	NA
August	0.22 (0.04–1.3)	0.103
September	NA
October	0.18 (0.02–1.73)	0.136

OR odds ratio; CI confidence interval; ICU intensive care unit; NA not applicable