| Control (n = 138) | Intervention (n = 134) | 95% CI of the difference | |
| Change in working ability (%) | |||
| Much better | 1 | 4 | |
| Slightly better | 13 | 11 | |
| No change | 47 | 49 | |
| Slightly worse | 31 | 31 | |
| Much worse | 8 | 6 | |
| Presence of health problems (%) | |||
| Depression | 14 | 8 | −3 to 14 |
| Fatigue | 8 | 4 | −2 to 11 |
| Stress | 7 | 2 | −1 to 11 |
| Pain | 19 | 20 | −11 to 9 |
| Physical impairment | 58 | 51 | −5 to 19 |
| Insomnia | 11 | 11 | −8 to 8 |
| Working ability | 49 | 52 | −15 to 9 |
| Depression OR fatigue OR stress | 19 | 11 | −1 to 17 |