Refining clinical phenotypes by contrasting ethnically different populations with schizophrenia from Australia, India and Sarawak

Duncan McLean, Sujit John, Robert John Barrett, John McGrath, Peter Loa, Rangaswamy Thara, Bryan Mowry

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    We contrasted demographic and clinical characteristics in transethnic schizophrenia populations from Australia (. n=. 821), India (. n=. 520) and Sarawak, Malaysia (. n=. 298) and proposed cultural explanations for identified site differences. From these we aimed to identify candidate variables free from significant cultural confounding that are hence suitable for inclusion in genetic analyses. We observed five phenomena: (1) more individuals were living alone in Australia than India or Sarawak; (2) drug use was lower in India than Australia or Sarawak; (3) duration of untreated psychosis (DUP) was longer in India than Australia or Sarawak; (4) the rate of schizoaffective disorder was lower in India than Australia or Sarawak; and (5) age at psychosis onset (AAO) was older in Sarawak than Australia or India. We suggest that site differences for living arrangements, drug use and DUP are culturally confounded. The schizoaffective site difference likely results from measurement bias. The AAO site difference, however, has no obvious cultural or measurement bias explanation. Therefore, this may be an ideal candidate for use in genetic studies, given that genetic variants affecting AAO have already been proposed.

    Original languageEnglish
    Pages (from-to)194-200
    Number of pages7
    JournalPsychiatry Research
    Volume196
    Issue number2-3
    DOIs
    Publication statusPublished - 30 Apr 2012

    Keywords

    • Age of onset
    • Culture
    • Psychotic disorders

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