Table 3.

Catheter-Related Blood Stream Infection Rates per ICU Month of Observation by Time Period^*

Time Period*	ICU Months of Observation (%)	Proportion with Zero CRBSI (%)	p-value**
Preintervention baseline	203 (23)	59	Reference
Periintervention	218 (25)	66	.17
0–3 months postintervention	193 (22)	74	.002
4–6 months postintervention	145 (16)	74	.003
7–9 months postintervention	54 (6)	80	.005
Unknown	69 (8)	75	.016

^*Time period is measured in relation to implementation of the CRBSI intervention.

^**p-value for comparison with the proportion of ICU-months with zero CRBSI at preintervention baseline using two-sample test of proportion.

CRBSI, catheter-related blood stream infection; ICU, intensive care unit.