Table 1.
Patient characteristics for the two groups (mean ± SD or number)
| Group A (n = 40) | Group B (n = 40) | P value | |
|---|---|---|---|
| Sex( F/M) | 29/11 | 27/13 | x2, P = 0.63 |
| Age (years) | 71 ± 6 | 70 ± 7 | t-test, P = 0.24 |
| BMI (kg/m2) | 27.3 ± 6.3 | 26.8 ± 5.1 | t-test, P = 0.17 |
| Aetiology (OA/RA) | 33/7 | 32/8 | x2, P = 0.78 |
| Preoperative Hb (g/l) | 133 ± 11.7 | 135 ± 10.9 | t-test, P = 0.53 |
| Preoperative Hct (%) | 42.4 ± 5.3 | 43.1 ± 4.3 | t-test, P = 0.52 |
| Preoperative circumference length of the knee (cm) | 36.4 ± 1.4 | 36.9 ± 1.5 | t-test, P = 0.05 |
| Preoperative range of motion (°) | 91 ± 16 | 92 ± 13 | t-test, P = 0.67 |
| Anaesthesia (general/spinal) | 10/30 | 12/28 | x2, P = 0.62 |
| Operating time (min) | 73 ± 19 | 82 ± 15 | t-test, P = 0.06 |