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11 - Early environmental risk factors for schizophrenia

Published online by Cambridge University Press:  04 August 2010

Mary Cannon
Affiliation:
Institute of Psychiatry, King's College, London, UK; Royal College of Surgeons in Ireland, Dublin, Ireland
Kimberlie Dean
Affiliation:
Institute of Psychiatry, King's College, London, UK
Peter B. Jones
Affiliation:
University of Cambridge, UK
Matcheri S. Keshavan
Affiliation:
University of Pittsburgh
James L. Kennedy
Affiliation:
Clarke Institute of Psychiatry, Toronto
Robin M. Murray
Affiliation:
Institute of Psychiatry, London
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Summary

The existence of early environmental risk factors for schizophrenia is central to the notion of schizophrenia as a neurodevelopmental disorder (Marenco and Weinberger, 2000; McDonald et al., 2000) and these risk factors represent some of the most challenging and interesting targets of schizophrenia epidemiology. This chapter discusses prenatal and perinatal risk factors for schizophrenia. Childhood developmental impairment and later environmental and psychosocial risk factors are dealt with in Chs. 22 and 13, respectively.

Prenatal risk factors for schizophrenia

Time and place of birth

The risk of developing schizophrenia has consistently been found to be increased (1.5 to 2-fold) among those born in cities compared with those born in rural areas (Lewis et al., 1992; Marcelis et al., 1998; Mortensen et al., 1999; Takei et al., 1995; Torrey and Bowler, 1990). Studies that have teased apart the effects of urban birth and urban living (Marcelis et al., 1999) have found that the greatest risk was for those born in urban areas, with no additional effect of later urban residence, indicating that the urban risk factor or factors associated with an increase in risk of schizophrenia appear to act in early life rather than around the time of illness onset. Linear trends for risk of schizophrenia with increasing population density of area of birth have been noted (Marcelis et al., 1998; Mortensen et al., 1999).

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Publisher: Cambridge University Press
Print publication year: 2004

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Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

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Save book to Dropbox

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.

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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

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