Outcome and independent variables included in the analysis
| Time point when data were collected | |||
|---|---|---|---|
| Baseline | 3-year follow-up | 3-year follow-up | |
| Outcome | |||
| Expected work limitation | √ | ||
| Independent factors | |||
| Health factors | |||
| Physical function | √ | ||
| Extent of pain | √ | √ | √ |
| Comorbidity | √ | √ | √ |
| Smoking | √ | ||
| Depression | √ | √ | √ |
| Anxiety | √ | √ | √ |
| Body mass index | √ | √ | √ |
| Cognitive impairment | √ | √ | √ |
| Control of health | √ | ||
| Sociodemographic | |||
| Age | √ | ||
| Gender | √ | ||
| Educational attainment | √ | ||
| Occupational classification | √ | ||
| Adequacy of income | √ | ||
| Live alone | √ | ||
| Workplace factors | |||
| Work type | √ | ||
| Work status | √ | ||
| Physical demands of job | √ | ||
| Flexible working | √ | ||
| Use of aids and appliances | √ | ||
| Opportunities to retrain | √ | ||
| Work satisfaction | √ | ||