• Acta Psychiatr Scand · May 2010

    The Stockholm non-affective psychoses study (snaps): the importance of including out-patient data in incidence studies.

    • L Jörgensen, A Ahlbom, P Allebeck, and C Dalman.
    • Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden. lena.jorgensen@ki.se <lena.jorgensen@ki.se>
    • Acta Psychiatr Scand. 2010 May 1; 121 (5): 389-92.

    ObjectiveTo estimate the incidence rate of schizophrenia and non-affective psychoses from registers, to highlight the importance of including data from out-patient care, and to assess the proportion of persons treated in out-patient care only.MethodData from out-patient and in-patient psychiatric care in Stockholm and information from several national registers constitute 'The Stockholm Non-Affective Psychoses Study' (SNAPS). Incidence rates based on SNAPS data were calculated and compared to in-patient care incidence rates.ResultsThe incidence rate was 72/100 000 for non-affective psychoses (age group 18-44) and 28/100 000 for schizophrenia (age group 18-34) in the SNAPS. This was higher compared to in-patient based incidence rates (42 and 13/100 000 respectively). The proportion of individuals with psychosis treated in out-patient care only was 25%.ConclusionThere are substantial differences in the incidence rates of non-affective psychoses and schizophrenia depending on the availability of data. Not including out-patient care will underestimate the incidence rates.

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