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Table 4 Univariate analysis of the risk factors for transfusion in THA

From: The incidence and risk factors for allogenic blood transfusion in total knee and hip arthroplasty

Variable Non-transfusion (n = 824) Transfusion (n = 169) P value
Female gender (%) 491 (59.6) 132 (78.1) < 0.001*
Age, years (mean ± SD) 63.7 (14.1) 61.9 (15.2) 0.142
BMI, kg/m2 (mean ± SD) 23.4 (3.7) 23.6 (3.9) 0.518
Diabetes (%) 78 (9.5) 17 (10.1) 0.811
Hypertension (%) 250 (30.3) 59 (34.9) 0.242
Malignance (%) 22 (2.7) 3 (1.8) 0.499
Smoking (%) 107 (13.0) 21 (12.4) 0.843
Diagnosis    0.019*
 OA (%) 119 (14.4) 33 (19.5)  
 RA (%) 8 (1.0) 6 (3.6)  
 Femoral neck fracture (%) 346 (42.0) 55 (32.5)  
 ONFH (%) 216 (26.2) 39 (23.1)  
 DDH (%) 83 (10.1) 23 (13.6)  
 AS (%) 44 (5.3) 10 (5.9)  
 Previous septic arthritis (%) 8 (1.0) 3 (1.8)  
PT, s (mean ± SD) 11.6 (1.0) 11.7 (1.1) 0.177
INR (mean ± SD) 1.02 (0.09) 1.03 (0.11) 0.146
APTT, s (mean ± SD) 27.4 (4.9) 27.5 (4.1) 0.698
Preoperative Hb level, g/L (mean ± SD) 130.1 (15.1) 119.1 (14.4) < 0.001*
PLT, 109/L (mean ± SD) 197.8 (62.5) 193.0 (63.0) 0.361
Operation time, min (mean ± SD) 99.6 (28.0) 117.9 (36.4) < 0.001*
Intraoperative blood loss, mL (mean ± SD) 314.6 (163.5) 456.0 (183.3) < 0.001*
  1. SD standard deviation, BMI body mass index, OA osteoarthritis, RA rheumatoid arthritis, ONFH osteonecrosis of the femur head, DDH developmental dysplasia of the hip, AS ankylosing spondylitis, PT prothrombin time, INR international normalized ratio, APTT activated partial thromboplastin time, Hb hemoglobin, PLT platelet count
  2. *P < 0.05 was considered statistically significant