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Table 1 The baseline characteristics of the patients underwent routine primary TKA

From: Tourniquet use in routine primary total knee arthroplasty is associated with a higher transfusion rate and longer postoperative length of stay: a real-world study

Baseline Characteristics No Tourniquet (n = 1423) Tourniquet use (n = 4902) All patients (n = 6325) P values
Demographic characteristics
 Age (M ± SD) 66.67 ± 8.77 66.58 ± 8.74 66.60 ± 8.75 0.722
 Female, N (%) 1099 (77.23%) 3872 (78.99%) 4971 (78.59%) 0.155
 BMI 24.89 ± 3.56 25.83 ± 3.5.36 25.62 ± 5.02 0.000*
 Diagnoses, N (%)     0.145
  OA 1321 (92.83%) 4603 (93.90%) 5924 (93.66%)  
  Inflammatory arthritis 102 (7.17%) 299 (6.10%) 401 (6.34%)  
 Comorbidities, N (%)
  Hypertension 224 (15.74%) 1483 (30.25%) 1707 (26.99%) 0.000*
  Type 2 diabetes 51 (3.58%) 382 (7.79%) 433 (6.85%) 0.000*
  CHD 15 (1.05%) 202 (4.13%) 217 (3.43%) 0.000*
  COPD 4 (0.28%) 30 (0.61%) 34 (0.54%) 0.133
 Preoperative analgesic use N (%) 241 (16.94%) 1551 (31.64%) 1792 (28.33%) 0.000*
 Preoperative laboratories
  Preoperative Hb (g/L) 128.54 ± 15.24 132.04 ± 16.02 131.25 ± 15.91 0.000*
  Preoperative ALB (g/L) 41.72 ± 2.54 40.86 ± 2.98 40.83 ± 2.89 0.095
 Operative variables
  Anesthesia, N (%)     0.000*
   General 1271 (89.32%) 3056 (62.34%) 4327 (68.41%)  
   Regional 152 (10.68%) 1846 (37.66%) 1998 (31.59%)  
  ASA class, N (%)     0.007*
    < 3 1303 (91.57%) 4367 (89.09%) 5670 (89.64%)  
    ≥ 3 120 (8.43%) 535 (10.91%) 655 (10.36%)  
  TXA use N (%) 639 (44.91%) 2758 (56.26%) 3397 (53.71%) 0.000*
  Drain use, N (%) 564 (39.63%) 3976 (81.11%) 4540 (71.78%) 0.000*
  Intraoperative blood loss (mL) 168.43 ± 100.56 166.55 ± 97.71 166.97 ± 98.36 0.526
  Operative time (min) 81.60 ± 27.28 87.32 ± 29.51 86.03 ± 29.12 0.000*
  1. BMI body mass index; OA osteoarthritis; CHD coronary heart disease; COPD chronic obstructive pulmonary disease; Hb hemoglobin; ALB albumin; ASA American Society of Anesthesiologists; TXA tranexamic acid. *: p < 0.05