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IQ and non-clinical psychotic symptoms in 12-year-olds : results from the ALSPAC birth cohort
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Horwood, Jeremy, Salvi, Giovanni, Thomas, Kate, Hollis, Chris, Lewis, Glyn, Menezes, Paulo, Thompson, Andrew D., Wolke, Dieter, Zammit, Stanley and Harrison, Glynn (2008) IQ and non-clinical psychotic symptoms in 12-year-olds : results from the ALSPAC birth cohort. British Journal of Psychiatry, 193 (3). pp. 185-191. doi:10.1192/bjp.bp.108.051904 ISSN 0007-1250.
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Official URL: http://dx.doi.org/10.1192/bjp.bp.108.051904
Abstract
Background Non-clinical psychotic symptoms appear common in children, but it is possible that a proportion of reported symptoms result from misinterpretation. There is a well-established association between pre-morbid low IQ score and schizophrenia. Psychosis-like symptoms in children may also be a risk factor for psychotic disorder but their relationship with IQ is unclear.
Aims To investigate the prevalence, nature and frequency of psychosis-like symptoms in 12-year-old children and study their relationship with IQ.
Method Longitudinal study using the Avon Longitudinal Study of Parents and Children (ALSPAC) birth cohort. A total of 6455 children completed screening questions for 12 psychotic symptoms followed by a semi-structured clinical assessment. IQ was assessed at 8 years of age using the Wechsler intelligence Scale for Children (3rd UK edition).
Results The 6-month period prevalence for one or more symptoms was 13.7% (95% Cl 12.8-14.5). After adjustment for confounding variables, there was a non-linear association between IQ score and psychosis-like symptoms, such that only those with below average IQ score had an increased risk of reporting such symptoms.
Conclusions Non-clinical psychotic symptoms occur in a significant proportion of 12-year-olds. Symptoms are associated with low IQ and also less strongly with a high IQ score. The pattern of association with IQ differs from that observed in schizophrenia.
Item Type: | Journal Article | ||||
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Subjects: | R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry R Medicine > RJ Pediatrics |
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Health Sciences > Mental Health and Wellbeing Faculty of Science, Engineering and Medicine > Science > Psychology Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Intelligence levels, Psychoses in children, Longitudinal method, Cohort analysis, Child psychopathology | ||||
Journal or Publication Title: | British Journal of Psychiatry | ||||
Publisher: | Royal College of Psychiatrists | ||||
ISSN: | 0007-1250 | ||||
Official Date: | September 2008 | ||||
Dates: |
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Volume: | 193 | ||||
Number: | 3 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 185-191 | ||||
DOI: | 10.1192/bjp.bp.108.051904 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Wellcome Trust (London, England) | ||||
Grant number: | 072043 (WT) | ||||
Version or Related Resource: | Thompson, A., et al. (2008). IQ and non-clinical psychotic symptoms in 12-year olds : results from the ALSPAC birth cohort. [Abstract]. Early Intervention in Psychiatry, 2(suppl.1), pp. A55. http://wrap.warwick.ac.uk/id/eprint/27859 | ||||
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