Polytomous logistic regression | ||||||||||
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Exposure total | Exposure | Cumulative exposure | Moderate grade | High grade | p –value {heterogeneity | |||||
 | Cases | OR* | 95% CI | Cases | OR* | 95% CI |  | |||
Manual handling of burdens (score) | 1st Tertile | 0 | - ≤ 2.654 | 446 | 1.00 |  | 88 | 1.00 |  |  |
2nd Tertile | > 2.655 | - ≤ 6.808 | 360 | 0.93 | 0.76 – 1.12 | 83 | 1.03 | 0.74 – 1.44 |  | |
3rd Tertile | > 6.808 |  | 372 | 1.01 | 0.83 – 1.22 | 87 | 1.08 | 0.77 – 1.50 | 0.81 | |
Sedentary work (score) | Unexposed | 0 | Â | 750 | 1.00 | Â | 162 | 1.00 | Â | Â |
1st Tertile | > 0 | - ≤ 1.6 | 153 | 1.04 | 0.81 – 1.31 | 24 | 0.77 | 0.48 – 1.22 |  | |
2nd Tertile | >1.6 | - ≤ 5.108 | 132 | 0.81 | 0.64 – 1.04 | 29 | 0.82 | 0.54 – 1.26 |  | |
3rd Tertile | >5.108 |  | 143 | 0.98 | 0.77 – 1.29 | 43 | 1.30 | 0.89 – 1.89 | 0.21 | |
Work load (score) | 1st Tertile | > 0 | - ≤ 102 | 312 | 1.00 |  | 54 | 1.00 |  |  |
2nd Tertile | > 103 | - ≤ 127 | 409 | 1.21 | 0.99 – 1.48 | 87 | 1.36 | 0.94 – 1.96 |  | |
3rd Tertile | > 128 |  | 457 | 1.35 | 1.09 – 1.57 | 117 | 1.66 | 1.14 – 2.41 | 0.57 | |
Total cumulative activity (score) | 1st Tertile | > 0 | - ≤ 69 | 362 | 1.00 |  | 84 | 1.00 |  |  |
2nd Tertile | > 69 | - ≤ 98 | 422 | 1.23 | 1.01 – 1.50 | 74 | 0.82 | 0.58 – 1.16 |  | |
3rd Tertile | > 98 |  | 394 | 1.20 | 0.98 – 1.46 | 100 | 1.05 | 0.75 – 1.48 | 0.06 | |
Physical workload (score) | 1st Tertile | 0 | - ≤ 2.656 | 414 | 1.00 |  | 72 | 1.00 |  |  |
2nd Tertile | > 2.656 | - ≤ 7.132 | 360 | 0.96 | 0.79 -1.17 | 103 | 1.46 | 1.05 – 2.04 |  | |
3rd Tertile | > 7.132 | Â | 404 | 1.14 | 0.94 -1.38 | 83 | 1.22 | 0.86 - 1.74 | 0.03 |