Letters Cannabis use and psychosis

Are these results clinically relevant?

BMJ 2011; 342 doi: http://dx.doi.org/10.1136/bmj.d1952 (Published 18 April 2011) Cite this as: BMJ 2011;342:d1952
  1. Sameer Jauhar, specialty registrar in psychiatry1,
  2. Stephen M Lawrie, head2
  1. 1Sackler Institute of Psychobiological Research, Institute of Neurological Sciences, Southern General Hospital, Glasgow, UK
  2. 2Division of Psychiatry, Royal Edinburgh Hospital, Edinburgh, EH10 5HF, UK
  1. sameerjauhar{at}gmail.com
  • Competing interests: None declared.

Kuepper and colleagues’ results are based on the Munich version of the composite international diagnostic interview (M-CIDI), which is not a valid diagnostic tool, so any clinical interpretation should be made cautiously.1 The CIDI itself was devised as an epidemiological tool, and the …

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