Reducing unnecessary crossmatching for hip fracture patients by accounting for preoperative hemoglobin concentration

Table 1 Preoperative characteristics of 498 hip fracture cases before vs after implementation of a patient blood management program, n (%)

Variable	Pre-PBM (n = 201) (January 2013 – December 2014)		Post-PBM (n = 297) (January 2015 – May 2017)		P value
	mean ± SD		mean ± SD
Age (yr)	77 ± 15		76 ± 16		0.68
Case mix index1	1.9 ± 0.6		1.9 ± 0.9		0.36
Preoperative Hb, g/dL	12.1 ± 1.9		12.1 ± 2.0		0.96
Male sex		58 (29)		110 (37)	0.26
Cardiac disease		42 (20.3)		67 (23.0)
Congestive heart failure		11 (5.3)		19 (6.5)	0.04
Pacemaker		18 (8.7)		37 (12.7)	0.57
Chronic kidney disease		18 (8.7)		37 (12.7)	0.15
COPD		30 (14.5)		47 (16.2)
Requiring home oxygen		9 (4.3)		14 (4.8)
Anti-platelet agent use		80 (38.7)		103 (35.4)	0.57
Anticoagulation use		27 (12.0)		48 (16.5)	0.29
Extracapsular Fracture		127 (61)		169 (58)	0.46
Independent in ADL		152 (73.4)		215 (73.9)	0.91
Cephalomedullary nail		122 (59)		161 (55)	0.78

¹Case mix index is the weighted all patients refined diagnosis related group score. COPD: Chronic obstructive pulmonary disease; ADL: Activities of daily living; PBM: Patient blood management.