Table 5.

Unadjusted and Adjusted Associations Between Postvoid Residual (PVR) Volume and Urinary Tract Infection Risk

	Unadjusted model		Multivariable model*
	HR (95% CI)	P	HR (95% CI)	P
PVR=50–99 versus PVR<50 mL	1.34 (0.74–2.42)	.33	1.33 (0.74–2.39)	.34
PVR=100–199 versus PVR<50 mL	1.22 (0.48–3.15)	.67	1.21 (0.48–3.05)	.69
PVR≥200 versus PVR<50 mL	2.27 (1.00–5.17)	.05	1.91 (0.81–4.50)	.14

^*Hazard ratios were obtained from modified Cox proportional hazards models that estimated independent associations of PVR volume at each study visit (baseline, 1 year, 2 year) with risk of UTI at either that same visit or during the subsequent year. Models were adjusted for age, race, body mass index, frequency of sexual activity, history of surgery to the urinary tract, and diabetes, and used multiple imputation to address missing co-variate data.