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Confidence intervals should be used in reporting trials

BMJ 2000; 321 doi: (Published 25 November 2000) Cite this as: BMJ 2000;321:1351
  1. Martin Bland, professor of medical statistics
  1. Department of Public Health Sciences, St George's Hospital Medical School, London SW17 0RE

    EDITOR—The dispute between Barber and Thompson,1 who are advocating a t test, and Williams, Cohen, and Russell, who are advocating a Mann-Whitney U test,2 has its roots in the use of P values rather than confidence intervals. If Williams et al had reported their results as a confidence interval for the difference in mean cost, as recommended for the results of clinical trials published in the BMJ, the question would not have arisen. The sample …

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