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Table 1 Baseline characteristics of enrolled patients

From: 3-h drain clamping is not effective to reduce total blood loss after primary total knowledge

 3-h drain clamping group
(n = 43)
Control group
(n = 43)
P value
Age, year71.9 ± 6.572.0 ± 6.40.756
Sex, male: female7: 367: 361.000
Body mass index, kg/m225.1 ± 3.325.2 ± 3.20.611
Diagnosis1.000
 Osteoarthritis41 (95.3%)41 (95.3%) 
 Rheumatoid arthritis2 (4.7%)2 (4.7%) 
Preoperative anemia12 (27.9%)13 (30.2%)0.640
Aspirin7 (16.3%)5 (11.6%)0.218
Prosthesis, NexGen LPS: Genesis II33: 1033: 101.000
  1. Preoperative anemia was diagnosed through a preoperative assessment, and threshold was defined by the World Health Organization (<12.0 g/dL in women and <13.0 g/dL in men)
  2. Values were presented as mean ± standard deviation or as number (percentage)
  3. Abbreviations: Genesis II posterior stabilized Genesis II TKA (Smith & Nephew, Memphis, TN, USA), NexGen LPS NexGen Legacy Posterior Stabilized TKA (Zimmer, Warsaw, Indiana, USA)