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Table 1 Patient’s demographic, clinical, and surgical characteristics

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

Characteristics Total (n = 1534) TKA (n = 541) THA (n = 993)
Gender
 Male (%) 467 (30.4) 97 (17.9) 370 (37.3)
 Female (%) 1067 (69.6) 444 (82.1) 623 (62.7)
Age, years (mean ± SD) 64.8 ± 12.5 67.4 ± 7.4 63.4 ± 14.3
BMI, kg/m2 (mean ± SD) 24.4 ± 4.0 26.1 ± 3.8 23.4 ± 3.8
Diabetes (%) 184 (12.0) 89 (16.5) 95 (9.6)
Hypertension (%) 548 (35.7) 239 (44.2) 309 (31.1)
Malignance (%) 41 (2.7) 16 (3.0) 25 (2.5)
Smoking (%) 160 (10.4) 32 (5.9) 128 (12.9)
Diagnosis
 OA (%) 643 (41.9) 491 (90.8) 152 (15.3)
 RA (%) 64 (4.2) 50 (9.2) 14 (1.4)
 Femoral neck fracture (%) 401 (26.1) 401 (40.4)
 ONFH (%) 255 (16.6) 255 (25.7)
 DDH (%) 106 (6.9) 106 (10.7)
 AS (%) 54 (3.5) 54 (5.4)
 Previous septic arthritis (%) 11 (0.7) 11 (1.1)
PT, s (mean ± SD) 11.5 ± 1.0 11.4 ± 0.9 11.6 ± 1.0
INR (mean ± SD) 1.01 ± 0.09 1.00 ± 0.08 1.02 ± 0.09
APTT, s (mean ± SD) 26.9 ± 4.5 25.9 ± 3.8 27.4 ± 4.8
Preoperative Hb level, g/L (mean ± SD) 127.9 ± 14.9 127.3 ± 13.8 128.2 ± 15.5
PLT, 109/L (mean ± SD) 200.4 ± 64.3 206.7 ± 66.9 197.0 ± 62.6
Operation time, min (mean ± SD) 110.3 ± 29.8 124.2 ± 23.1 102.7 ± 30.4
Intraoperative blood loss, mL (mean ± SD) 290.2 ± 168.9 201.3 ± 111.0 338.7 ± 175.2
  1. TKA total knee arthroplasty, THA total hip arthroplasty, 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