Intended for healthcare professionals

Endgames Statistical question

Study design

BMJ 2009; 339 doi: (Published 22 July 2009) Cite this as: BMJ 2009;339:b2893
  1. Philip Sedgwick, senior lecturer in medical statistics
  1. 1Centre for Medical and Healthcare Education, St George’s, University of London, Tooting, London SW17 0RE
  1. p.sedgwick{at}

    Researchers investigated whether the incidence of schizophrenia differed between ethnic groups. Fifteen electoral wards in south London were studied and cases of schizophrenia were identified from hospital computer records. Ethnicity was established using UK census data. Data for both schizophrenia and ethnicity was aggregated for the local population in each electoral ward. When the 15 electoral wards were compared, those wards that had the largest proportion of residents who identified with a non-white ethnicity also had the highest number of cases of schizophrenia diagnosed at hospitals in that …

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