Letters

Effect size

BMJ 1995; 310 doi: https://doi.org/10.1136/bmj.310.6980.672 (Published 11 March 1995) Cite this as: BMJ 1995;310:672
  1. Colin Borland
  1. Consultant physician Hinchingbrooke Hospital, Huntingdon, Cambridgeshire PE18 8NT

    EDITOR,—In their article on the development of a symptom based outcome measure for asthma Nick Steen and colleagues erroneously define effect size as the difference between baseline and follow up scores divided by the standard error of …

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