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

From: Outcome in hip fracture patients related to anemia at admission and allogeneic blood transfusion: an analysis of 1262 surgically treated 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
  1. Values are given as number (percentage), unless mentioned otherwise.
  2. * P-value comparing 3 treatment groups, **RR and p-value comparing neck of femur with (inter-) trochanteric fractures.
  3. RR = relative risk; CI = confidence interval; ASA = American Society of Anesthesiologists Physical Status classification, ABT = allogeneic blood transfusion.