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Research Methods & Reporting

How to design efficient cluster randomised trials

BMJ 2017; 358 doi: https://doi.org/10.1136/bmj.j3064 (Published 14 July 2017) Cite this as: BMJ 2017;358:j3064

Data supplement

  • Web extra

    • Data Supplement - Appendices 1-3: Appendix 1â€"Formula and notation; Appendix 2â€"Illustration of how to construct power and precision curves; Appendix 3â€"Derivation of a simple rule to determine if a minimal increase in the number of clusters can lead to a significant reduction in cluster size.
    • Data Supplement - Supplementary figures: Power and precision curves for case study for ICCs of 0.01 and 0.05

  • Web extra

    • Data Supplement - Appendices 1-3: Appendix 1â€"Formula and notation; Appendix 2â€"Illustration of how to construct power and precision curves; Appendix 3â€"Derivation of a simple rule to determine if a minimal increase in the number of clusters can lead to a significant reduction in cluster size.
    • Data Supplement - Supplementary figures: Power and precision curves for case study for ICCs of 0.01 and 0.05

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  • Implementation of the Symptom Navi (C) Programme for cancer patients in the Swiss outpatient setting: a study protocol for a cluster randomised pilot study (Symptom Navi(C) Pilot Study)
  • PARROT Ireland: Placental growth factor in Assessment of women with suspected pre-eclampsia to reduce maternal morbidity: a Stepped Wedge Cluster Randomised Control Trial Research Study Protocol
  • Ethical implications of excessive cluster sizes in cluster randomised trials
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