BMJ 1996; 312 doi: (Published 01 June 1996) Cite this as: BMJ 1996;312:1392

Randomised study of n of 1 trials versus standard practice

A potentially important error occurred in this paper by Jeffrey Mahon and colleagues (27 April, pp 1069-74). The authors cited the wrong reference at number 21 (concerned with the argument that the minimal clinically important difference for n of 1 trials shown by a seven point Likert scale is a mean change of 0.5 per symptom). The correct reference is:

21 Jaeschke R, Guyatt GH, Keller J, Singer J. Interpreting changes in quality-of-life score in n of 1 randomized trials. Control Clin Trials 1991;12:226-33S.

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