Table 2.

Hazard Ratios for Clostridium difficile Infection within 8 Weeks after Baseline.

	Female			Male			All
Independent Variables	HR	95% CI	P-value	HR	95% CI	P-value	HR	95% CI	P-value
Baseline status: Nontoxigenic C. difficile compared to no C. difficile	5.13	1.47, 17.83	0.010	0.44	0.04, 4.43	0.482	1.92	0.68, 5.46	0.221
Covariates:
Age	1.00	0.97, 1.03	0.926	1.04	0.99, 1.08	0.100	1.02	0.99, 1.04	0.229
Female	_	_	_	_	_	_	1.10	0.47, 2.57	0.833
Non-White	0.89	0.19, 4.23	0.884	2.93	0.73, 11.77	0.130	1.63	0.59, 4.48	0.346
Nursing home, previous	11.42	1.08, 121.07	0.043	3.97	0.34, 46.57	0.273	3.89	0.78, 19.43	0.098
Charlson Deyo score	1.11	0.8, 1.54	0.512	1.06	0.73, 1.52	0.769	1.11	0.89, 1.40	0.357
Number admissions during previous 28 days	0.47	0.07, 3.06	0.429	1.43	0.3, 6.54	0.645	0.88	0.29, 2.68	0.816
Number nights in hospital during previous 180 days	0.99	0.95, 1.03	0.560	0.99	0.94, 1.04	0.633	0.99	0.95, 1.02	0.422
Number prior positive C. difficile tests	1.31	0.15, 11.58	0.809	1.48	0.65, 3.39	0.352	1.25	0.54, 2.91	0.602