Table 1.

Univariable associations of use of antimicrobials with prevalence of C.difficile and prevalence at different periods*

Class of antimicrobial	Odds ratio	95% CI	P-value
IN FEED			0.33
Tetracycline	0.77	0.55-1.08
DAYS ON FEED			0.47
< 62	4.25	0.73-24.63
62-71	1.07	0.21-5.38
> 71	Referent	Referent

* controlling for lack of independence sampling