. Author manuscript; available in PMC: 2015 Mar 1.

Published in final edited form as: Infect Control Hosp Epidemiol. 2014 Jan 24;35(3):243–250. doi: 10.1086/675292

Table 1. Characteristics of the Intervention and Control Intensive Care Units.

Variable	Intervention (Surgical) ICU (Dec. 2002-Dec. 2007)	Control (Medical) ICU (Jan. 2005-Dec. 2007)	p ^c
Number of beds	24	19	NA
Patient days, total^a	35124	18402	NA
Ventilator utilization ratio, monthly, median (range)^a	0.69 (0.45-0.80)	0.59 (0.43-0.68)	<.001
Central venous catheter utilization ratio, monthly, median (range)^a	0.66 (0.44-0.81)	0.59 (0.46-0.76)	0.008
Patient characteristics, monthly proportion, median (range)^b
Decubitus ulcer (Stage II or greater)	0.23 (0.14-0.38)	0.22 (0.16-0.34)	0.08
Tracheostomy	0.20 (0.11-0.54)	0.18 (0.11-0.25)	0.003
Enteral tube feeding	0.28 (0.17-0.69)	0.22 (0.17-0.40)	0.004
MRSA colonization on admission	0.17 (0.06-0.38)	0.24 (0.13-0.38)	<.001

Note: MRSA - methicillin-resistant Staphylococcus aureus; ICU – intensive care unit; NA – not applicable.

Patients with >2 day stay in ICU only.

Proportion of all ICU admissions with variable of interest during ICU stay, per month.

Determined by Mann-Whitney U test