166 6 Chapter 6 Figure 2. ‘Risk of bias’ summary: review author’s judgement about each risk of bias for each individual study. Legend 1. Random sequence generation (selection bias) 2. Allocation concealment (selection bias) 3. Blinding of participants and personnel (performance bias): all outcomes 4. Blinding of outcome assessment (detection bias): all outcomes 5. Incomplete outcome data (attrition bias): all outcomes 6. Selective reporting (reporting bias) 7. Other bias 8. Recruitment bias 9. Baseline imbalance between groups 10. Loss to follow-up clusters 11. Adequate analysis methods for cluster RCT
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