. Author manuscript; available in PMC: 2018 Jan 1.

Published in final edited form as: J Hosp Infect. 2016 Nov 4;95(1):91–97. doi: 10.1016/j.jhin.2016.10.022

Table II.

Relative risk of MRSA acquisition per one unit increase in person days of exposure to MRSA treated and untreated carriers

	Primary Analysis				Sensitivity Analysis
	No lag				3-day lag		5-day lag
Variable	RR	95% CI	aRR	95% CI	aRR	95% CI	aRR	95% CI
Days of exposure to untreated carrier	1.07^a	1.02–1.11	1.06^a	1.01–1.11	1.06 ^a	1.02–1.10	1.05 ^a	1.02–1.09
Days of exposure to treated carrier	1.01	0.99–1.05	1.01	0.98–1.04	1.01	0.98–1.04	1.01	0.98–1.05

At-risk neonates (n=3783) neonates were included in analysis. Relative risks calculated from Poisson generalized estimated equations. Exposures measured in person-days. Lag time refers to the number of days prior to each weekly surveillance screen that colonization status conversions were assumed to have occurred. Adjusted models control for year of admission, daily unit census, whether neonate was inborn at JHH, length of stay, and unit hand hygiene compliance.

Significant at p<0.05.

Abbreviations: RR, unadjusted relative risk; aRR, adjusted relative risk.