Wu 2006.
Methods | Cluster‐randomized trial | |
Participants | 961 teachers in 8 middle schools. 4 intervention (n = 459) and 4 control (n = 502) schools in Sichuan Province, China. After adjusting for clustering, the number of participants used in the analysis were 338 and 370 respectively | |
Interventions | 1‐ Intervention strategies involving both individual (stress management) and organisational approaches (e.g. redesigning the task, establishing flexible work schedules and redesigning the work environment) 2‐ No‐intervention control |
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Outcomes | Occupational Stress Inventory‐Revised Edition, Work Ability Index Surveys conducted at baseline and 12 months post intervention |
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Notes | Results of baseline measures were fed back to teachers in the intervention schools in order to develop the organisational component of the intervention. There is no further information on the final content of the organisational component Date of the intervention: Not reported Funding: National Natural Science Foundation of China (Grant 39970623) Conflict of interest: Unknown |
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Risk of bias | ||
Bias | Authors' judgement | Support for judgement |
Random sequence generation (selection bias) | Unclear risk | Schools were randomly selected into study group and control group, but no mention of method of sequence generation |
Allocation concealment (selection bias) | Unclear risk | Not reported |
Blinding of participants and personnel (performance bias) All outcomes | Unclear risk | No evidence, not applicable |
Blinding of outcome assessment (detection bias) All outcomes | Unclear risk | Not reported |
Incomplete outcome data (attrition bias) All outcomes | High risk | No mention of attrition in data and no mention if ITT analysis. Mean difference calculation in Review Manager 5 revealed a significant effect in the Role Insufficiency subscale, while the study does not report it to be significant. This may be due to the authors calculating the mean difference with the actual numbers after attrition, while we had to assume numbers pre‐ and post‐intervention to be the same |
Selective reporting (reporting bias) | Low risk | All stated outcome data reported |
Recruitment bias | Unclear risk | Not reported |
Baseline imbalance | Low risk | No relevant baseline differences in age, gender, educational level and marital status (P > 0.05) |
Incorrect analysis | High risk | There is no mention of accounting for clustering in the analysis, and so we assume that clustering has not been taken into account. We corrected for clustering by employing the intracluster correlation coefficient for the burnout scale (0.003) provided by Brown 2010 |
Other bias | Unclear risk | Not reported |