Independent variable

B

SE

P

OR

95%CI

Constant term

13.42

4.652

<0.001

<0.001

4.652 - 23.632

Number of puncturing times

3.782

0.746

<0.001

8.762

4.053 - 23.685

Positioning method

6.322

0.674

<0.001

9.253

5.693 - 32.157

Maintenance frequency

5.736

0.324

0.003

10.324

2.329 - 24.956