Table 3 Logistic regression analysis for ergonomic risk-factor exposure and work-related LBP

 None

(ref)

(ref)

 Mild

2.28 (2.04–2.54)*

1.86 (1.65–2.08)*

 Moderate

4.71 (4.21–5.28)*

3.27 (2.89–3.69)*

 Severe

7.90 (6.97–8.94)*

5.09 (4.46–5.83)*

 None

(ref)

(ref)

 Mild

0.90 (0.85–0.95)**

0.82 (0.77–0.88)*

 Moderate

0.98 (0.86–1.12)

0.78 (0.68–0.89)*

 Severe

2.55 (2.11–3.09)*

1.98 (1.62–2.42)*

 None

(ref)

(ref)

 Mild

1.89 (1.76–2.04)*

1.38 (1.27–1.50)*

 Moderate

2.68 (2.45–2.93)*

1.64 (1.49–1.82)*

 Severe

3.34 (2.94–3.79)*

2.09 (1.82–2.40)*

 None

(ref)

(ref)

 Mild

1.45 (1.32–1.60)*

1.09 (0.98–1.20)

 Moderate

2.03 (1.84–2.24)*

1.35 (1.21–1.50)*

 Severe

2.56 (2.30–2.84)*

1.79 (1.60–2.01)*

 None

(ref)

(ref)

 Mild

1.47 (1.31–1.64)*

1.23 (1.10–1.38)*

 Moderate

2.35 (2.11–2.62)*

1.69 (1.51–1.90)*

 Severe

3.08 (2.76–3.44)*

2.04 (1.82–2.30)*