Table 2 Analysis of variance of related factors of preoperative preparation time and related factors

sex

0.550

0.033

0.857

male

4.95 ± 3.371

female

5.15 ± 3.321

ages

<0.001

0.736

0.596

18–40

3.28 ± 1.934

41–60

3.73 ± 3.276

61–70

4.56 ± 3.239

71–80

5.15 ± 3.274

81–90

5.43 ± 3.330

<90

5.09 ± 3.274

AO types

<0.001

1.139

0.320

A1

4.60 ± 2.811

A2

5.30 ± 3.423

A3

5.41 ± 3.275

comorbidity

<0.001

10.031

<0.001

0

2.10 ± 1.199

1

3.19 ± 1.724

2

3.86 ± 1.782

≥ 3

5.86 ± 3.483

DVT

<0.001

0.000

0.990

yes

6.25 ± 3.840

no

4.82 ± 3.070