Intended for healthcare professionals


Cannabis and psychosis: Let's start from the null hypothesis

BMJ 2006; 332 doi: (Published 02 February 2006) Cite this as: BMJ 2006;332:303
  1. D B Double, consultant psychiatrist (
  1. Norfolk and Waveney Mental Health Partnership NHS Trust, Norwich NR6 5BE

    EDITOR—Fergusson at al say that it is better to reach interim conclusions about the relation between cannabis and psychosis despite the uncertain evidence.1 This is contrary to the scientific principle of starting from the null hypothesis. The null hypothesis should be overturned only if there is sufficient evidence.

    Moreover, the argument they use to tip the …

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