Association between heavy PWL and risk of frequent MSP with the addition of the chosen confounding variables among workers with baseline occasional MSP (crude ORs and AORs with 95% CIs)
| Men n=2573 | Women n=3142 | |||||||
| PWL index | PWL index | |||||||
| Low | Medium–low | Medium–high | High | Low | Medium–low | Medium–high | High | |
| Model 1 | ||||||||
| OR (95% CI) | 1 | 1.08 (0.78 to 1.50) | 1.38 (1.00 to 1.89) | 1.40 (1.02 to 1.93) | 1 | 1.24 (0.95 to 1.61) | 1.45 (1.11 to 1.88) | 1.74 (1.34 to 2.27) |
| Model 2 | ||||||||
| AOR (95% CI) | 1 | 1.06 (0.76 to 1.48) | 1.30 (0.94 to 1.80) | 1.34 (0.96 to 1.86) | 1 | 1.25 (0.96 to 1.63) | 1.43 (1.10 to 1.87) | 1.71 (1.31 to 2.25) |
| Model 3 | ||||||||
| AOR (95% CI) | 1 | 1.04 (0.75 to 1.45) | 1.29 (0.92 to 1.80) | 1.26 (0.88 to 1.82) | 1 | 1.22 (0.93 to 1.60) | 1.41 (1.10 to 1.86) | 1.71 (1.29 to 2.28) |
| Model 4 | ||||||||
| AOR (95% CI) | 1 | 1.12 (0.80 to 1.56) | 1.59 (1.08 to 2.34) | 1.66 (1.09 to 2.56) | 1 | 1.24 (0.94 to 1.63) | 1.46 (1.06 to 2.01) | 1.76 (1.26 to 2.46) |
| Model 5 | ||||||||
| AOR (95% CI) | 1 | 1.10 (0.78 to 1.53) | 1.50 (1.01 to 2.22) | 1.59 (1.03 to 2.46) | 1 | 1.26 (0.95 to 1.66) | 1.45 (1.04 to 2.01) | 1.74 (1.24 to 2.45) |
| Model 6 | ||||||||
| AOR (95% CI) | 1 | 1.05 (0.75 to 1.48) | 1.39 (0.92 to 2.10) | 1.42 (0.89 to 2.28) | 1 | 1.25 (0.94 to 1.66) | 1.45 (1.04 to 2.02) | 1.74 (1.20 to 2.50) |
Model 1—adjusted for age.
Model 2—model 1+health and lifestyle factors (smoking, long-term illness, psychological distress, BMI and leisure-time physical activity).
Model 3—model 1+education.
Model 4—model 1+decision authority.
Model 5—model 2+decision authority.
Model 6—model 2+education and decision authority.
AOR, adjusted OR; BMI, body mass index; MSP, musculoskeletal pain; PWL, physical workload.