Table 5 Backwards stepwise binary logistic regression of the risk factors for HBL in patients with knee osteoarthritis involvement undergoing TKA

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