Guidelines are needed for evaluations that use cluster approach

BMJ 1997; 315 doi: https://doi.org/10.1136/bmj.315.7122.1620a (Published 13 December 1997) Cite this as: BMJ 1997;315:1620
  1. Diana Elbourne, Senior lecturera
  1. Department of Epidemiology and Population Health, Medical Statistics Unit, London School of Hygiene and Tropical Medicine, London WC1E 7HT

    Editor—The recent report of the success of feedback to general practitioners about their prescribing practices1 contains important messages both about the potential for major public health benefits resulting from changing doctors' behaviour and about alternative methods for evaluating heath education interventions.2 In this example, taking the general practice as the unit of randomisation rather …

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