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Table 2 Univariate analysis of the risk factors for transfusion in TKA

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

Variable Non-transfusion (n = 436) Transfusion (n = 105) P value
Female gender (%) 350 (80.3) 94 (89.5) 0.027*
Age, years (mean ± SD) 67.5 (7.2) 66.6 (8.5) 0.264
BMI, kg/m2 (mean ± SD) 26.1 (3.7) 26.2 (4.3) 0.762
Diabetes (%) 69 (15.8) 20 (19.1) 0.424
Hypertension (%) 198 (45.4) 41 (39.1) 0.238
Malignance (%) 12 (2.8) 4 (3.8) 0.566
Smoking (%) 28 (6.4) 4 (3.8) 0.308
Diagnosis of RA (%) 36 (8.3) 14 (13.3) 0.107
PT, s (mean ± SD) 11.4 (0.9) 11.5 (0.8) 0.189
INR (mean ± SD) 0.99 (0.08) 1.01 (0.07) 0.192
APTT, s (mean ± SD) 25.8 (3.9) 26.5 (3.7) 0.076
Preoperative Hb level, g/L (mean ± SD) 128.8 (13.2) 121.1 (14.5) < 0.001*
PLT, 109/L (mean ± SD) 207.3 (65.3) 204.1 (73.5) 0.657
Operation time, min (mean ± SD) 124.1 (22.7) 124.6 (24.5) 0.822
Intraoperative blood loss, mL (mean ± SD) 189.4 (95.5) 250.4 (151.0) < 0.001*
  1. SD standard deviation, BMI body mass index, RA rheumatoid arthritis, 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