Authors' reply

BMJ 1996; 312 doi: https://doi.org/10.1136/bmj.312.7039.1157c (Published 04 May 1996) Cite this as: BMJ 1996;312:1157
  1. Kwame Mckenzie,
  2. Brian Toone,
  3. Tom Fahy,
  4. Robin Murray,
  5. Jim Van Os,
  6. Peter Jones,
  7. Ian Harvey
  1. Honorary research fellow Consultant psychiatrist Consultant psychiatrist Professor of psychiatry Department of Psychological Medicine, Institute of Psychiatry and Kings College Hospital, London SE5 8AF
  2. Senior lecturer Department of Psychiatry, Section of Social Psychiatry and Psychiatric Epidemiology, University of Limburg, Maastrict 6200 MD, Netherlands
  3. Senior lecturer Department of Psychiatry, University of Nottingham, Nottingham NG3 6AA
  4. Consultant psychiatrist Towers Hospital, Leicester LE5 0TD

    EDITOR,—Nitin B Purandare and Priyadarshan Neelkanth Joshi question the sampling in our study. We gathered data from several people and places for each patient. To ensure that the data were collected close to the time of admission and were of high quality, a break from assessments was necessary every third month. We doubt whether this introduced a systematic bias in terms of ethnicity and outcome.

    Use of cannabis did not differ between the two groups.1 Premorbid personality was investigated but did not explain our findings. We reported that whether a patient of Caribbean …

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