Table 2.

Hierarchical logistic regression to identify factors associated with transfer of one or more critical care patient each day from Victorian intensive care units (ICUs)

	Odds ratio (95% CI)	P
Univariable analysis
ICU Activity Index	3.34 (2.2–5.05)	< 0.001
Multivariable analysis
ICU Activity Index	4.10 (2.34–7.18)	< 0.001
Occupancy	0.48 (0.14–1.64)	0.25
Critical care staff unavailable⁎	1.00 (0.95–1.05)	0.94
Hospital type†
Public tertiary	1.00‡
Public metropolitan	3.75 (1.38–10.15)	0.009
Public rural	8.26 (2.81–24.3)	< 0.001
Private	0.42 (0.11–1.58)	0.20

^⁎Critical care staff unavailable at each site each day due to COVID-19 exposure or disease.

^†Hospital site entered as a random effect (variance, 0.53; 95% CI, 0.23–1.25); area under receiver operating characteristic, 0.84 (95% CI, 0.81–0.87).

^‡Reference value.