Education And Debate Statistics notes: Sample size in cluster randomisation BMJ 1998; 316 doi: https://doi.org/10.1136/bmj.316.7130.549 (Published 14 February 1998) Cite this as: BMJ 1998;316:549 Article Related content Metrics Responses Peer review Related articles Research Internal and external validity of cluster randomised trials: systematic review of recent trials Published: 17 April 2008; BMJ 336 doi:10.1136/bmj.39517.495764.25 See more Population attributable fraction BMJ February 22, 2018, 360 k757; DOI: https://doi.org/10.1136/bmj.k757 Statistics Notes: Percentage differences, symmetry, and natural logarithms BMJ August 16, 2017, 358 j3683; DOI: https://doi.org/10.1136/bmj.j3683 Statistics Notes: What is a percentage difference? BMJ August 16, 2017, 358 j3663; DOI: https://doi.org/10.1136/bmj.j3663 Inverse probability weighting BMJ January 15, 2016, 352 i189; DOI: https://doi.org/10.1136/bmj.i189 Statistics Notes: Bootstrap resampling methods BMJ June 02, 2015, 350 h2622; DOI: https://doi.org/10.1136/bmj.h2622 Cited by... A coregulatory influence map of glioblastoma heterogeneity and plasticity - From cells in vitro to tumors and back againAbstract Fulltext PDF The Effect of Creatine Supplementation on Muscle Function in Childhood Myositis: A Randomized, Double-blind, Placebo-controlled Feasibility StudyAbstract Fulltext PDF Value of small sample sizes in rapid-cycle quality improvement projectsAbstract Fulltext PDF Prospective, Multicenter, Randomized Trial of a New Organizational Modality for Providing Information and Support to Cancer PatientsAbstract Fulltext PDF Data quality of animal health records on Swiss dairy farmsAbstract Fulltext PDF Internal and external validity of cluster randomised trials: systematic review of recent trialsAbstract Fulltext PDF Bonded versus banded first molar attachments: a randomized controlled clinical trialAbstract Fulltext PDF A randomized clinical trial comparing 'one-step' and 'two-step' orthodontic bonding systemsAbstract Fulltext PDF Peer led programme for asthma education in adolescentsAbstract Fulltext PDF Randomised controlled trials in primary care: case studyAbstract Fulltext PDF Considerations for the design and analysis of experimental studies in physical activity and exercise promotion: advantages of the randomised controlled trialAbstract Fulltext PDF Statistics notes: The intracluster correlation coefficient in cluster randomisationAbstract Fulltext PDF