Table 5 Odds ratio of having low back pain at 72 h

Gender (male/female)

1.23

0.33–4.57

0.759

1.06

0.26–4.40

0.936

Age

1.02

0.98–1.06

0.347

1.02

0.98–1.06

0.436

Try (two/one)

5.46

2.04–14.58

0.001

4.47

1.61–12.43

0.004

Injection site (L4–L5/L3–L4)

5.07

1.62–15.90

0.005

4.04

1.23–13.30

0.022

Group (paramedian/median)

1.55

0.62–3.88

0.346

1.06

0.38–2.90

0.917