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An interaction of medical and statistical ethics
  1. D J Finney
  1. David J Finney, University of Edinburgh, 13 Oswald Court, South Oswald Road, Edinburgh EH9 2HY, UK; David.Finney{at}


It is argued that the practice of omitting outliers when calibrating thromboplastin time, as recommended by the World Health Organization, should not continue unless it can be justified statistically and that possible harmful effects of omitting such data should be investigated.

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  • Competing interests: None declared.

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