. Author manuscript; available in PMC: 2020 Mar 1.

Published in final edited form as: Transfusion. 2019 Feb 10;59(3):1125–1131. doi: 10.1111/trf.15189

TABLE 3.

Final model for allogeneic RBC use in hospitals

	AIC	p value^*	Pseudo-R²
Null model	30,112	…	0.0%
Step 1: Annual inpatient surgical volume	28,136	<0.0001	70.8%
Step 2: Model from Step 1 + oncology service	27,993	<0.0001	73.3%
Step 3: Model from Step 2 + USPHS region	27,922	<0.0001	74.8%
Step 4: Model from Step 3 + Level 2/3 OB service	27,873	<0.0001	75.6%
Step 5: Model from Step 4 + trauma service	27,857	<0.0001	75.8%
Step 6: Model from Step 5 + urban location	27,845	0.0002	76.1%
Step 7: Model from Step 6 + organ transplant service	27,836	0.0009	76.2%
Step 8: Model from Step 7 + residency training program	27,835	0.0490	76.3%

P value refers to significance of last-added variable.

AIC = Akaike information criterion; USPHS = US Public Health Service.