Predischarge Postpartum Methicillin Resistant Staphylococcus aureus Infection and Group B Streptococcus Carriage at the Individual and Hospital Levels

Table 3

Multivariable adjusted* odds ratio and 95% confidence intervals for the association of individual GBS carriage and hospital GBS prevalence with early postpartum MRSA infection.

Analysis	Exposure	Odds ratio	95% CI
Without imputation of missing values	Individual GBS colonization	1.2	0.9–1.5
	Hospital prevalence of GBS colonization**	1.3	0.2–11.3
With multiple imputation of missing values	Individual GBS colonization	1.2	0.9–1.5
	Hospital prevalence of GBS colonization**	0.9	0.1–5.6
With multiple imputation and bias adjustment for obesity	Individual GBS colonization	1.1	0.8–1.5
	Hospital prevalence of GBS colonization**	0.9	0.1–5.6

∗All models adjusted for patient age, race, expected payer, and prepregnancy diabetes and hospital teaching status, urbanicity, bed size, ownership, and geographic region.
∗∗Odds ratio is for a 5% increase in the prevalence of GBS colonization.