Table 2.
Analysis of pre- and post-operative factors associated with the need for blood transfusion (using Pearson χ2 and t-test).
| Pre- and post-operative Variables | Transfusion N (%) |
No transfusion N (%) |
P-value |
|---|---|---|---|
| Sex | NS | ||
| Male | 7 (8.8) | 8 (7.4) | |
| Female | 73 (91.2) | 100 (92.6) | |
| Age (years) | 64.5 ± 0.8 | 63.5 ± 0.7 | NS |
| Comorbidities | 48 (60.0) | 73 (67.6) | NS |
| Obesity | 53 (66.3) | 83 (76.9) | NS |
| Site | |||
| Right | 33 (41.3) | 55 (58.7) | NS |
| Left | 47 (50.9) | 53 (49.1) | |
| Type of anesthesia | NS | ||
| General anesthesia | 73 (91.2) | 91 (84.3) | |
| Spinal anesthesia | 7 (8.8) | 17 (15.7) | |
| Tourniquet use | 37 (46.3) | 44 (40.7) | NS |
| Diagnosis | NS | ||
| Osteoarthritis | 69 (86.2) | 99 (91.7) | |
| Rheumatoid arthritis | 11 (13.8) | 9 (8.3) | |
| Admission duration (days) | 9.2 ± 0.2 | 8.9 ± 0.2 | NS |
| Preoperative Hb g/dl | 12.9 ± 0.1 | 12.1 ± 0.1 | 0.000 |
| Blood loss (ml) | 1276.7 ± 59.1 | 898.2 ± 36.4 | 0.000 |
| Hb loss at 6 h (g/dl) | 1.7 ± 0.1 | 1.3 ± 0.1 | 0.006 |
| Hb loss at 24 h (g/dl) | 1.8 ± 0.2 | 1.4 ± 0.1 | 0.000 |
| BMI (kg/m2) | 33.0 ± 0.6 | 34.1 ± 0.4 | NS |
Hb, hemoglobin.