Table 2.

HOB Predictors in the Simple Model^a With Estimated Incidence Rate Ratios ^b

Parameter	IRR (95% CI) c	P Value
COB rate per 100 admissions	1.39 (1.33–1.45)	<.0001
LOS, mean d	1.20 (1.18–1.22)	<.0001
Bed size
1–100 beds		Reference
101–200 beds	1.40 (1.26–1.56)	<.0001
201–300 beds	1.85 (1.66–2.05)	<.0001
301–500 beds	1.98 (1.78–2.19)	<.0001
≥500 beds	2.23 (2.00–2.49)	<.0001
ICU admissions, %
<2nd quartile		Reference
3rd quartile	1.12 (1.06–1.18)	<.0001
4th quartile	1.19 (1.12–1.26)	<.0001
Not reported	1.64 (1.49–1.79)	<.0001
Sex, female, %	0.99 (0.99–1.00)	0.0017
Patients aged 41-64 y, %	1.02 (1.01–1.02)	<.0001
Patients aged >80 y, %	0.97 (0.96–0.97)	<.0001
Urban or rural status
Rural		Reference
Urban	1.08 (1.03–1.14)	0.0013

Note. CI, confidence interval; COB, community-onset bacteremia; HOB, hospital-onset bacteremia; ICU, intensive care unit; IRR, incidence rate ratio; LOS, length of stay.

^aGoodness-of-fit statistics: Akaike information criteria, 13,409; Bayesian information criteria, 13,501.

^bFor model replication purposes, regression coefficients and standard errors are presented in Supplementary Table S1 (online).

^cEstimated increase in HOB relative to the reference. As an example, for hospitals with 101–200 beds, the IRR was 1.40. Holding other variables constant in the model, hospitals with 101–200 beds are expected to have a HOB rate 1.40 times greater (40% greater) than the hospitals with 1–100 beds.