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Weightings for analysing general practices' prescribing

BMJ 1996; 312 doi: (Published 10 February 1996) Cite this as: BMJ 1996;312:378

Pooling of data from practices was inappropriate

  1. Sarah J Robertsa
  1. Lecturer in medical statistics Wolfson Unit of Clinical Pharmacology, University of Newcastle, Newcastle upon Tyne NE2 4HH

    EDITOR,—In their paper presenting cost weightings based on patients' age and sex for general practice prescribing within therapeutic groups Lloyd and colleagues1 use methods that they suggest are “slightly different” from those that colleagues and I used in a study.2 In fact, the methodology is crucially different. Although Lloyd and colleagues obtained data separately for each practice, the prescribing costs and items by age, sex, and therapeutic …

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