Table 3 Analysis of multivariate Cox regression of preoperative preparation time and related factors

sex (male vs. female)

-0.78

0.055

2.039

0.153

0.925

0.830

1.030

ages

0.011

0.003

15.161

<0.001

1.011

1.005

1.016

AO types

4.396

0.111

A2 vs. A1

-0.076

0.053

2.111

0.146

0.926

0.835

1.027

A3 vs. A1

-0.185

0.095

3.759

0.053

0.831

0.690

1.002

comorbidity

340.849

<0.001

1 vs. 0

0.912

0.137

44.156

<0.001

0.402

0.307

0.526

2 vs. 0

1.311

0.125

110.841

<0.001

0.271

0.212

0.345

≥ 3 vs. 0

2.082

0.128

264.728

<0.001

0.125

0.097

0.160

DVT

-0.296

0.061

23.362

<0.001

0.744

0.660

0.839