Comparison of primary and secondary outcomes in intervention and control clusters
| n | Baseline | Follow-up | Difference between baseline and follow-up (95% CI) | Intervention effect adjusted for baseline and clustering* | |
|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | ||||
| Primary outcomes | |||||
| Well-being score | |||||
| Control | 59 | 50.4 (8.0) | 49.0 (8.5) | −1.4 (−2.8 to 0.0) | |
| Intervention | 225 | 51.0 (8.3) | 49.9 (8.3) | −1.1 (−1.9 to 0.2) | 0.5 (−3.2 to 4.2) |
| Days off sick from HR data† | |||||
| Control | 66 | 0.9 (2.0) | 1.0 (1.7) | 0.1 (−0.4 to 0.6) | |
| Intervention | 294 | 1.2 (3.2) | 1.6 (3.7) | 0.4 (−0.1 to 0.9) | 0.6 (−1.4 to 2.6) |
| Days off sick self-report† | |||||
| Control | 51 | 1.2 (3.5) | 1.3 (3.8) | 0.1 (−0.8 to 0.9) | |
| Intervention | 198 | 1.0 (3.0) | 1.3 (3.4) | 0.3 (−0.3 to 0.9) | 0.1 (−2.2 to 2.4) |
| Secondary outcomes | |||||
| GHQ | |||||
| Control | 59 | 3.2 (3.4) | 2.9 (3.7) | −0.3 (−1.1 to 0.4) | |
| Intervention | 216 | 2.8 (3.5) | 2.9 (3.5) | 0.0 (−0.4 to 0.5) | 0.2 (−2.0 to 2.5) |
| Supervisor relationships | |||||
| Control | 59 | 74 (21) | 75 (19) | 0.9 (−5.6 to 7.4) | |
| Intervention | 224 | 72 (20) | 71 (21) | −1.5 (−3.8 to 0.9) | −3.3 (−14.1 to 7.5) |
| Supervisor support | |||||
| Control | 59 | 87 (23) | 86 (21) | −0.8 (−8.7 to 7.0) | |
| Intervention | 228 | 80 (23) | 80 (24) | −0.1 (−3.1 to 2.8) | −3.2 (−19.2 to 12.9) |
*The difference in well-being score and mean days off sick between intervention and control arms, adjusted for baseline and clustering.
†Excluding those off sick for more than 21 days at baseline.
GHQ, General Health Questionnaire.