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Number of patients required in lung function studies.
  1. A G Davison,
  2. P M Fayers,
  3. A J Nunn,
  4. K M Venables,
  5. A J Taylor


    Tables are presented showing estimates of the number of subjects which is required to give an 80% or 90% chance of detecting various differences in forced expiratory volume in one second, forced vital capacity, total lung capacity, transfer factor, and residual volume between the mean of two groups by means of Student's t test.

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