Table 4.

Positive blood cultures per 1000 patient-days by study group and by study period

Study group	Baseline period		Intervention period		Follow-up period		Comparison
	Number of isolates	Mean rate/ 1000 patient-days (CI95)	Number of isolates	Mean rate/ 1000 patient-days (CI95)	Number of isolates	Mean rate/ 1000 patient-days (CI95)	IRR (CI95), p-value Intervention vs. Baseline	IRR (CI95), p-value Follow-up vs. Baseline	IRR (CI95), p-value Follow-up vs. Intervention
Intervention group	161	1.42 (1.21, 1.66)	172	1.46 (1.25, 1.70)	53	1.78 (1.33, 2.32)	1.03 (0.83, 1.27), 0.80	1.25 (0.91, 1.69), 0.17	1.22 (0.88, 1.64), 0.22
Control group	226	1.98 (1.73, 2.26)	297	2.54 (2.26, 2.85)	59	2.08 (1.58, 2.68)	1.28 (1.08, 1.53), < 0.01	1.05 (0.78, 1.39), 0.74	0.82 (0.61, 1.07), 0.15

Abbreviations: IRR incidence rate ratio, CI95 95% confidence interval