Table 2.

Definition of Variables

CMI variables
Severity of illness index	Abbreviation	Definition
DRG costliness CMI	DRGCMI	CMI based on payments for DRGs
ICD principal diagnosis costliness CMI	ICDCMI-DC	CMI based on payment under ICD principal diagnosis groupings
ICD principal diagnosis LOS CMI	ICDCMI-DL	CMI based on LOS under ICD principal diagnosis groupings
ICD procedure costliness CMI	ICDCMI-PC	CMI based on payment under ICD procedure code groupings.
ICD procedure LOS CMI	ICDCMI-PL	CMI based on LOS under ICD procedure code groupings
Hospital variables
Accreditation status	ACC	Medical center (ACC = 1)
		Regional hospital (ACC = 2)
		Local hospital (ACC = 3)
		Non-accredited (ACC = 4)
Ownership	OWNER	Public (OWNER = 1)
		Non-profit (OWNER = 2)
		Private (OWNER = 3)
Teaching status	EDU	Teaching (EDU = 1)
		Non-teaching (EDU = 0)