Outcome in hip fracture patients related to anemia at admission and allogeneic blood transfusion: an analysis of 1262 surgically treated patients

Table 1 Relative risks for different demographic characteristics in anemic and non-anemic patients

Outcome	Anemic	Non-anemic	RR (CI)	P-value
	n = 536	n = 726
mean age in years (SD)	84.9 (6.9)	82.6 (7.0)	n/a	< 0.001
mean follow-up in months (SD)	42.7 (16.9)	42.2 (15.9)	n/a	0.578
Male gender	170 (31.7)	160 (22.0)	1.31 (1.15-1.50)	< 0.001
ASA III/IV	200 (37.3)	201 (27.7)	1.28 (1.12-1.45)	< 0.001
Fracture type
-neck of femur	252 (47.0)	450 (62.0)		< 0.001*
-(inter) trochanteric	266 (49.6)	256 (35.3)	0.70 (0.62-0.80)	< 0.001**
-subtrochanteric	18 (3.4)	20 (2.8)
Spinal anesthesia	494 (92.2)	684 (94.2)	0.84 (0.67-1.05)	0.149
ABT	309 (57.6)	153 (21.1)	2.36 (2.08-2.68)	< 0.001

Values are given as number (percentage), unless mentioned otherwise.
* P-value comparing 3 treatment groups, **RR and p-value comparing neck of femur with (inter-) trochanteric fractures.
RR = relative risk; CI = confidence interval; ASA = American Society of Anesthesiologists Physical Status classification, ABT = allogeneic blood transfusion.

ISSN: 1471-2474