Table 6.

Negative binomial regression model identifying factors associated with longer length of stay

Variable	Incidence rate ratio (95% CI)	P value
CAUTI	1.3 (1.0–1.7)	0.05
POUR	1.2 (1.1–1.2)	<0.001
Age, 10 years	1.0 (1.0–1.0)	0.03
Female gender	1.0 (0.9–1.0)	0.18
BMI, 5 kg/m2	1.0 (0.9–1.0)	<0.001
Surgery time, h	1.1 (1.1–1.1)	<0.001
Intraoperative IV fluid, L	1.0 (1.0–1.0)	0.09
Epidural	1.1 (1.1–1.2)	<0.001
ASA Class
1	Ref	Ref
2	1.1 (0.9–1.3)	0.58
3	1.1 (0.9–1.4)	0.18
4	1.4 (1.1–1.8)	0.01
Area
General abdominal*	Ref	Ref
Colon	1.0 (0.9–1.0)	0.23
Anorectal	1.0 (0.9–1.1)	0.72
Hepatobiliary	0.9 (0.8–1.0)	0.002
Pancreas	1.0 (0.9–1.1)	0.47
Retroperitoneum	0.9 (0.7–1.0)	0.03
Inguinal	0.9 (0.7–1.2)	0.13
Thyroid/skin soft tissue	0.8 (0.7–1.1)	0.14
Emergent	1.3 (1.2–1.4)	<0.001
Approach
Open	Ref	Ref
Laparoscopic	0.8 (0.8–0.8)	<0.001
Robotic	0.9 (0.7–1.1)	0.11
Perineal	0.7 (0.5–1.0)	0.04

Abbreviations: CAUTI, catheter associated urinary tract infection; CI, confidence interval BMI, body mass index; IV, intravenous; POUR, postoperative urinary retention; Ref, reference

^*Includes hernia, small bowel, and gastroesophageal