Letters

Matching in case-control studies

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6975.329d (Published 04 February 1995) Cite this as: BMJ 1995;310:329
  1. Henrik Toft Sorensen,
  2. Matthew W Gillman
  1. Associate professor Danish Epidemiology Science Centre, University of Aarhus, 8000 Aarhus C, Denmark
  2. Assistant professor Department of Ambulatory Care and Prevention, Harvard Medical School and Harvard Community Health Plan, 126 Brookline Avenue, Boston, MA 02215, USA

    EDITOR,—J Martin Bland and Douglas G Altman's review of the advantages and disadvantages of matching in case-control studies omits two important problems.1

    Firstly, matching in case-control studies ensures that the matching factors, such as age or sex, are equally distributed between cases and controls. …

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