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Louise Arseneault a SGDP Research
Centre, King's College, London SE5 8AF, b Division of Psychological Medicine, King's College, c Dunedin
Multidisciplinary Health and Development Research Unit, University of
Otago, Dunedin, New Zealand Correspondence to: T E Moffitt
t.moffitt@iop.kcl.ac.uk
| The first 150 words of the full text of this article appear below. |
The strongest evidence that cannabis use may be a risk factor for later psychosis comes from a Swedish cohort study which found that heavy cannabis use at age 18 increased the risk of later schizophrenia sixfold. 1 2 This study could not establish whether adolescent cannabis use was a consequence of pre-existing psychotic symptoms rather than a cause. We present the first prospective longitudinal study of adolescent cannabis use as a risk factor for adult schizophreniform disorder, taking into account childhood psychotic symptoms3 antedating cannabis use.
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Methods and results |
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The Dunedin multidisciplinary health and development study (a
study of a general population birth cohort of 1037 individuals born in
Dunedin, New Zealand, in 1972-3)4 has a 96% follow up
rate at age 26. It obtained information on psychotic symptoms at age 11 and drug use at ages 15 and 18 from self reports and assessed
psychiatric symptoms at age 26 with a standardised interview schedule
to obtain DSM-IV (diagnostic and statistical manual
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