Table 5.
Backwards stepwise binary logistic regression of the risk factors for HBL in patients with knee osteoarthritis involvement undergoing TKA
| Characteristic | Univariable | Multivariable | ||
|---|---|---|---|---|
| OR (95% CI) | p-value | OR (95% CI) | p-value | |
| CAD | 1.74 (1.16 to 2.61) | 0.007 | 1.72 (1.12 to 2.63) | 0.013 |
| WBC (× 109/L) | 0.91 (0.82 to 1.00) | 0.039 | - | 0.582 |
| Hct (L/L) | 83.28 (2.05 to 3389.10) | 0.019 | - | 0.449 |
| Hb (g/L) | 1.02 (1.01 to 1.03) | 0.004 | - | 0.308 |
| PLT (× 109/L) | 0.99 (0.99 to 1.00) | < 0.001 | 0.99 (0.99 to 1.00) | < 0.001 |
| D-dimer (μg/mL) | 0.76 (0.61 to 0.94) | 0.011 | 0.81 (0.66 to 1.00) | 0.057 |
| Left knee/right knee | 1.45 (1.10 to 1.92) | 0.009 | 1.44 (1.07 to 1.93) | 0.015 |
| CMTKA/RTKA | 3.61 (2.13 to 6.10) | < 0.001 | 4.48 (2.56 to 7.83) | < 0.001 |
| Operation time (min) | 1.01 (1.00 to 1.01) | < 0.001 | 1.01 (1.01 to 1.02) | < 0.001 |
| IBL > 20% | 1.68 (1.18 to 2.40) | 0.004 | 0.306 | |
| EPO prescription | - | - | ||
| No prescription | - | - | - | - |
| Preoperation | 0.38 (0.23 to 0.60) | < 0.001 | 0.41 (0.25 to 0.67) | < 0.001 |
| Postoperation | 1.07 (0.78 to 1.48) | 0.665 | 1.20 (0.85 to 1.68) | 0.295 |
CAD coronary artery disease, TKA total arthroplasty, OR odd ratios, CI confidence interval, WBC white blood cell count, Hct hematocrit, Hb hemoglobin, PLT platelet, CMTKA conventional manual total knee arthroplasty, RTKA robotic-assisted total knee arthroplasty, IBL Intraoperative blood loss, EPO erythropoietin