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Comparing cohort incidence of schizophrenia with that of bipolar disorder and affective psychosis in individuals born in Stockholm County 1955–1967

Published online by Cambridge University Press:  20 July 2015

J. Söderlund ,
S. Wicks ,
L. Jörgensen  and
C. Dalman
J. Söderlund*
Affiliation:
Public Health Epidemiology, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden
S. Wicks
Affiliation:
Public Health Epidemiology, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden Centre for Epidemiology and Community Medicine, Stockholm County Council, Stockholm, Sweden
L. Jörgensen
Affiliation:
Public Health Epidemiology, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden Centre for Epidemiology and Community Medicine, Stockholm County Council, Stockholm, Sweden
C. Dalman
Affiliation:
Public Health Epidemiology, Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden Centre for Epidemiology and Community Medicine, Stockholm County Council, Stockholm, Sweden
*
* Address for correspondence: J. Söderlund, Department of Clinical Neuroscience, Karolinska Institutet, M76, Psykiatri SV, Karolinska University Hospital Huddinge, 14186 Stockholm, Sweden. (Email: johan.soderlund@ki.se)
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Abstract

Background.

Perinatal factors are associated with increased risk for both schizophrenia and bipolar disorder. Improvements in obstetric and maternal healthcare and positive socioeconomic development in Sweden from the 1950s onwards could be expected to affect incidence estimates. However, commonly incidence rates are calculated during a specific year, i.e. time of diagnosis, which mirrors proximal precipitating risk factors. To examine whether incidence estimates are compatible with the hypothesis of an impact of perinatal exposures on the risk of the different disorders we here instead calculate incidence rates for consecutive birth cohorts born between 1955 and 1967. We hypothesized that schizophrenia incidence would be more affected compared to bipolar disorder and other affective psychoses since most perinatal risk factors are more pronounced in schizophrenia aetiology.

Method.

Birth cohorts of individuals born in Sweden and resident in Stockholm (N = 2 16 322), were followed in The National Patient Register regarding incident inpatient episodes Incident cases/10 000 person-years and birth cohort were calculated. Linear regression was used to estimate change in incidence rate.

Results.

We found stable birth cohort-based incidence estimates for bipolar disorder and other affective psychoses, but a continuous reduction in incidence estimates for schizophrenia as well as other non-affective psychoses in subsequent birth cohorts from 1955 to 1967.

Conclusions.

The consecutive birth cohort-based incidence estimates unveiled patterns that are compatible with the hypothesis of an impact of early life exposures decreasing over time, in the aetiology of schizophrenia, whereas this pattern is less apparent in affective psychoses..

Keywords

Bipolar disorderbirth cohortinpatient incidencenon-affective psychosisperinatalschizophreniasocioeconomic status
Type
Original Articles
Information
Psychological Medicine , Volume 45 , Issue 16 , December 2015 , pp. 3433 - 3439
Copyright
Copyright © Cambridge University Press 2015 

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