Table 3 Multivariate logistic regression model for high intraoperative blood loss (≥ 500 mL)

Constant

−7.610

2.927

6.759

0.009*

Sex

−1.131

0.830

1.860

0.173

0.323

0.06 to 1.64

Preoperative Hb

0.195

0.142

1.893

0.169

1.216

0.92 to 1.61

Preoperative Cobb angle

0.020

0.021

0.897

0.344

1.020

0.98 to 1.06

Number of fused level

−0.162

0.133

1.473

0.225

0.851

0.66 to 1.10

Operation duration

0.015

0.004

14.931

< 0.001*

1.015

1.01 to 1.02

Number of anchors

0.310

0.110

8.013

0.005*

1.364

1.10 t0 1.69

Albumin

0.013

0.036

0.137

0.711

1.014

0.94 to 1.09