Letters

Multiple significance tests

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6986.1073 (Published 22 April 1995) Cite this as: BMJ 1995;310:1073
  1. Simon Voss,
  2. Steve George
  1. Medical adviser Southampton and South West Hampshire Health Commission, Southampton SO9 4WQ
  2. Senior lecturer in public health meicine Wessex Institute of Public Health Medicine, Southampton General Hospital, Southampton SO9 4XY

    EDITOR,—J Martin Bland and Douglas G Altman highlight the need, in significance testing, to take account of simultaneous tests that are not independent.1 This is a common situation in investigations of outbreaks of food poisoning. Such investigations usually take the form of a cohort or case-control study based on a questionnaire that contains questions about all, or as many as are known, of …

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