title: Psychotic-like experiences in a community sample of 8000 children aged 9 to 11 years: an item response theory analysis.
abstract: BACKGROUND
  Psychotic-like experiences (PLEs) in the general population are common, particularly in childhood, and may constitute part of a spectrum of normative development. Nevertheless, these experiences confer increased risk for later psychotic disorder, and are associated with poorer health and quality of life.
  
  
  METHODS
  This study used factor analytic methods to determine the latent structure underlying PLEs, problem behaviours and personal competencies in the general child population, and used item response theory (IRT) to assess the psychometric properties of nine PLE items to determine which items best represented a latent psychotic-like construct (PSY). A total of 7966 children aged 9-11 years, constituting 95% of eligible children, completed self-report questionnaires.
  
  
  RESULTS
  Almost two-thirds of the children endorsed at least one PLE item. Structural analyses identified a unidimensional construct representing psychotic-like severity in the population, the full range of which was well sampled by the nine items. This construct was discriminable from (though correlated with) latent dimensions representing internalizing and externalizing problems. Items assessing visual and auditory hallucination-like experiences provided the most information about PSY; delusion-like experiences identified children at more severe levels of the construct.
  
  
  CONCLUSIONS
  Assessing PLEs during middle childhood is feasible and supplements information concerning internalizing and externalizing problems presented by children. The hallucination-like experiences constitute appropriate items to screen the population to identify children who may require further clinical assessment or monitoring. Longitudinal follow-up of the children is required to determine sensitivity and specificity of the PLE items for later psychotic illness.
authors: Research Unit for Schizophrenia Epidemiology, School of Psychiatry, University of New South Wales, Sydney, Australia. Kristin.Laurens@kcl.ac.uk
authors: K R
authors: KR
authors: Laurens
authors: M J
authors: MJ
authors: Hobbs
authors: M
authors: M
authors: Sunderland
authors: M J
authors: MJ
authors: Green
authors: G L
authors: GL
authors: Mould
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002657:Child Development; D003702:Delusions / Q000175:diagnosis / Q000453:epidemiology / Q000523:psychology; D004812:Epidemiologic Methods; D005260:Female; D006212:Hallucinations / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D006801:Humans; D007389:Internal-External Control; D008131:London / Q000453:epidemiology; D008297:Male; D011594:Psychometrics; D011599:Psychopathology; D011618:Psychotic Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D057566:Self Report / Q000592:standards; D055815:Young Adult