Table 3.

Hazard Ratios for Clostridium difficile Infection from 8 Weeks to 1 Year after Baseline.

	Female			Male			All
Independent Variables	Hazard Ratio	95% CI	P-value	Hazard Ratio	95% CI	P-value	Hazard Ratio	95% CI	P-value
Baseline status: Nontoxigenic C. difficile compared to no C. difficile	1.24	0.4, 3.72	0.699	0.67	0.08, 5.30	0.703	1.14	0.44, 2.96	0.794
Baseline status: Nontoxigenic C. difficile compared to toxigenic C. difficile	0.53	0.19, 1.54	0.246	0.19	0.03, 1.37	0.098	0.43	0.17, 1.06	0.067
Baseline status: Toxigenic C. difficile compared to no C. difficile	2.32	1.30, 4.16	0.005	3.61	1.66, 7.86	0.001	2.67	1.68, 4.25	<0.001
Covariates:
Age	0.99	0.98, 1.00	0.019	1.00	0.98, 1.01	0.524	0.99	0.98, 1.00	0.022
Female	_	_	_	_	_	_	1.41	0.95, 2.10	0.089
Non-White	1.59	0.89, 2.84	0.114	0.59	0.24, 1.46	0.255	1.15	0.72, 1.85	0.566
Nursing home, previous	1.82	0.72, 4.62	0.204	1.92	0.72, 5.17	0.194	1.83	0.95, 3.54	0.071
Charlson Deyo score	1.01	0.85, 1.20	0.920	1.09	0.88, 1.36	0.441	1.04	0.9, 1.18	0.611
Number admissions during previous 28 days	1.20	0.74, 1.94	0.457	0.84	0.39, 1.83	0.667	1.06	0.72, 1.57	0.765
Number nights in hospital during previous 180 days	1.02	1.0, 1.03	0.004	1.02	1.00, 1.03	0.045	1.02	1.0, 1.03	0.001
Number prior positive C. difficile tests	1.31	0.95, 1.80	0.097	1.49	1.16, 1.92	0.002	1.42	1.16, 1.72	0.001