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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A 1995 study studied this question.
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