Table 4.
Prediction models between workload, psychosocial work stressors, and the number of anatomical pain regions stratified by baseline age.
| Outcome and Exposure Variables | Crude Models | Baseline Adjusted Models * | Fully Adjusted Models ** | |||
|---|---|---|---|---|---|---|
| B (95% CI) | p-Value | B (95% CI) | p-Value | B (95% CI) | p-Value | |
| Age < 50 Years | ||||||
| Prediction model 1, outcome: number of ARP at follow-up | ||||||
| Predictor: baseline mechanical exposure index | 0.12 (0.12 to 0.13) | <0.001 | 0.03 (0.02 to 0.04) | <0.001 | 0.03 (0.03 to 0.04) | <0.001 |
| Predictor: baseline physical exposure index | 0.10 (0.10 to 0.11) | <0.001 | −0.01 (−0.01 to 0.01) | 0.096 | 0.00 (−0.01 to 0.01) | 0.627 |
| Predictor: baseline job demands | 0.61 (0.58 to 0.64) | <0.001 | 0.23 (0.21 to 0.25) | <0.001 | 0.18 (0.16 to 0.20) | <0.001 |
| Predictor: baseline job control | −0.35 (−0.38 to −0.32) | <0.001 | −0.13 (−0.15 to −0.10) | <0.001 | −0.05 (−0.16 to 0.08) | 0.502 |
| Predictor: baseline job support | −0.45 (−0.48 to −0.43) | <0.001 | 0.03 (0.01 to 0.05) | 0.041 | −0.04 (−0.15 to 0.07) | 0.520 |
| Age ≥ 50 years | ||||||
| Prediction model 1, outcome: number of ARP at follow-up | ||||||
| Predictor: baseline mechanical exposure index | 0.15 (0.14 to 0.15) | <0.001 | 0.02 (0.02 to 0.03) | <0.001 | 0.01 (0.02 to 0.03) | 0.008 |
| Predictor: baseline physical exposure index | 0.13 (0.12 to 0.13) | <0.001 | 0.01 (0.00 to 0.02) | 0.009 | 0.03 (0.02 to 0.03) | <0.001 |
| Predictor: baseline job demands | 0.70 (0.67 to 0.72) | <0.001 | 0.11 (0.08 to 0.13) | <0.001 | 0.04 (0.01 to 0.07) | 0.024 |
| Predictor: baseline job control | −0.78 (−0.82 to −0.74) | <0.001 | −0.20 (−0.23 to −0.17) | <0.001 | 0.01 (−0.03 to 0.05) | 0.571 |
| Predictor: baseline job support | −0.85 (−0.89 to −0.82) | <0.001 | −0.18 (−0.21 to −0.15) | <0.001 | −0.07 (−0.10 to −0.03) | <0.001 |
| Age < 50 years | ||||||
| Prediction model 2, outcome: mechanical exposure index at follow-up | ||||||
| Predictor: baseline number of ARP | 0.26 (0.25 to 0.27) | <0.001 | 0.06 (0.05 to 0.07) | <0.001 | 0.03 (0.02 to 0.03) | <0.001 |
| Prediction model 2, outcome: physical exposure index at follow-up | ||||||
| Predictor: baseline number of ARP | 0.10 (0.09 to 0.11) | <0.001 | −0.01 (−0.01 to −0.00) | 0.001 | −0.02 (−0.02 to −0.01) | <0.001 |
| Prediction model 2, outcome: job demands at follow-up | ||||||
| Predictor: baseline number of ARP | 0.03 (0.02 to 0.03) | <0.001 | 0.01 (0.00 to 0.01) | <0.001 | 0.00 (−0.00 to 0.00) | 0.093 |
| Prediction model 2, outcome: job control at follow-up | ||||||
| Predictor: baseline number of ARP | −0.01 (−0.01 to −0.01) | <0.001 | 0.00 (0.00 to 0.00) | 0.168 | 0.01 (0.01 to 0.01) | <0.001 |
| Prediction model 2, outcome: job support at follow-up | ||||||
| Predictor: baseline number of ARP | −0.03 (−0.03 to −0.03) | <0.001 | −0.02 (−0.02 to −0.01) | <0.001 | −0.01 (−0.01 to −0.01) | <0.001 |
| Age ≥ 50 years | ||||||
| Prediction model 2, outcomes: workload and psychosocial work stressors at follow-up | ||||||
| Prediction model 2, outcome: mechanical exposure index at follow-up | ||||||
| Predictor: baseline number of ARP | 0.30 (0.29 to 0.32) | <0.001 | 0.02 (0.01 to 0.03) | <0.001 | 0.03 (0.02 to 0.04) | <0.001 |
| Prediction model 2, outcome: physical exposure index at follow-up | ||||||
| Predictor: baseline number of ARP | 0.13 (0.12 to 0.14) | <0.001 | −0.01 (−0.01 to −0.00) | 0.003 | 0.00 (−0.00 to 0.01) | 0.232 |
| Prediction model 2, outcome: job demands at follow-up | ||||||
| Predictor: baseline number of ARP | 0.03 (0.02 to 0.03) | <0.001 | 0.01 (0.00 to 0.01) | <0.001 | 0.01 (0.00 to 0.01) | <0.001 |
| Prediction model 2, outcome: job control at follow-up | ||||||
| Predictor: baseline number of ARP | −0.02 (−0.02 to −0.01) | <0.001 | −0.01 (−0.01 to −0.01) | <0.001 | 0.01 (0.00 to 0.01) | 0.004 |
| Prediction model 2, outcome: job support at follow-up | ||||||
| Predictor: baseline number of ARP | −0.03 (−0.03 to −0.03) | <0.001 | −0.01 (−0.01 to −0.01) | <0.001 | −0.01 (−0.01 to −0.01) | <0.001 |
ARP = anatomical regions with pain; B = regression coefficients; CI = confidence intervals. * Model adjusted for baseline physical workload, psychosocial work environment, and number of ARP; ** Model adjusted for baseline gender, education, smoking, alcohol intake, psychical activity, distress, and baseline workload, psychosocial work stressors, and the number of ARP.