Table 4.

Independent risk factors for urinary tract infection

Characteristic	P value	Estimated OR (95% CI)
Demographics
Age >65	<.001	1.322 (1.151–1.519)
Female sex	<.001	1.705 (1.508–1.928)
Admission in 3rd quarter	.014	1.220 (1.041–1.430)
Preoperative comorbidities
Nonindependent functional status	<.001	1.609 (1.299–1.993)
History of transient ischemic attack	.020	1.394 (1.053–1.846)
Steroid use for a chronic condition	.008	1.524 (1.116–2.080)
Meeting SIRS criteria	.039	1.393 (1.016–1.911)
Transfusion >4 U within 72 hours of surgery	.048	1.494 (1.004–2.221)
Intraoperative variables
ASA Class 4 (vs Class 1)	.011	2.146 (1.194–3.856)
Increased total operation time*	<.001	1.002 (1.002–1.003)
Open procedure	<.001	1.419 (1.240–1.624)
Rectal procedure	.001	1.267 (1.105–1.453)

ASA = American Society of Anesthesiologists; CI = confidence interval; OR = odds ratio; SIRS = systemic inflammatory response syndrome.

^*Odds ratio calculated per minute of increased operative time, actual odds ratio is 1.003-minute increased operative time.