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Sibship size, birth order and psychotic experiences: Evidence from 43 low- and middle-income countries
Universitat de Barcelona, Barcelona, Spain / Instituto de Salud Carlos III, Centro de Investigación Biomédica en Red de Salud Mental, CIBERSAM, Madrid, Spain.ORCID-id: 0000-0002-9565-5004
University of Southern California, CA, USA.
Södertörns högskola, Institutionen för samhällsvetenskaper, SCOHOST (Stockholm Centre for Health and Social Change).ORCID-id: 0000-0002-1260-2223
South London and Maudsley NHS Foundation Trust, London, United Kingdom / King's College London, London, United Kingdom / Anglia Ruskin University, Chelmsford, United Kingdom.
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2018 (engelsk)Inngår i: Schizophrenia Research, ISSN 0920-9964, E-ISSN 1573-2509, Vol. 201, s. 406-412Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Background Sibship size and birth order may be contributing factors to the multifactorial etiology of psychosis. Specifically, several studies have shown that sibship size and birth order are associated with schizophrenia. However, there are no studies on their association with psychotic experiences (PE). Methods Cross-sectional, community-based data from 43 low- and middle-income countries which participated in the World Health Survey were analyzed. The Composite International Diagnostic Interview was used to identify four types of past 12-month PE. The association of sibship size and birth order with PE was assessed with multivariable logistic regression. Results The final sample consisted of 212,920 adults [mean (SD) age 38.1 (16.0) years; 50.7% females]. In the multivariable analysis, compared to individuals with no siblings, the OR increased linearly from 1.26 (95%CI = 1.01–1.56) to 1.72 (95%CI = 1.41–2.09) among those with 1 and ≥ 9 siblings, respectively. Compared to the first-born, middle-born individuals were more likely to have PE when having a very high number of siblings (i.e. ≥9). Conclusions Future studies should examine the environmental and biological factors underlying the association between sibship size/birth order and PE. Specifically, it may be important to examine the unmeasured factors, such as childhood infections and adversities that may be related to both family structure and PE.

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Elsevier, 2018. Vol. 201, s. 406-412
Emneord [en]
Psychotic experience, Risk factor, Sibship size, Birth order
HSV kategori
Identifikatorer
URN: urn:nbn:se:sh:diva-35736DOI: 10.1016/j.schres.2018.06.019ISI: 000450604800060PubMedID: 29929772Scopus ID: 2-s2.0-85048792554OAI: oai:DiVA.org:sh-35736DiVA, id: diva2:1223451
Tilgjengelig fra: 2018-06-25 Laget: 2018-06-25 Sist oppdatert: 2020-03-24bibliografisk kontrollert

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