The Structure of The Extended Psychosis Phenotype in Early Adolescence-A Cross-sample Replication

JTW Wigman, WAM Vollebergh, QAW Raaijmakers, Jurjen Iedema, S Dorsselaer, J Ormel, Frank Verhulst, J van Os

Research output: Contribution to journalArticleAcademicpeer-review

148 Citations (Scopus)

Abstract

The extended psychosis phenotype, or the expression of nonclinical positive psychotic experiences, is already prevalent in adolescence and has a dose-response risk relationship with later psychotic disorder. In 2 large adolescent general population samples (n = 5422 and n = 2230), prevalence and structure of the extended psychosis phenotype was investigated. Positive psychotic experiences, broadly defined, were reported by the majority of adolescents. Exploratory analysis with Structural Equation Modelling (Exploratory Factor Analysis followed by Confirmatory Factor Analysis [CFA]) in sample 1 suggested that psychotic experiences were best represented by 5 underlying dimensions; CFA in sample 2 provided a replication of this model. Dimensions were labeled Hallucinations, Delusions, Paranoia, Grandiosity, and Paranormal beliefs. Prevalences differed strongly, Hallucinations having the lowest and Paranoia having the highest rates. Girls reported more experiences on all dimensions, except Grandiosity, and from age 12 to 16 years rates increased. Hallucinations, Delusions, and Paranoia, but not Grandiosity and Paranormal beliefs, were associated with distress and general measures of psychopathology. Thus, only some of the dimensions of the extended psychosis phenotype in young people may represent a continuum with more severe psychopathology and predict later psychiatric disorder.
Original languageUndefined/Unknown
Pages (from-to)850-860
Number of pages11
JournalSchizophrenia Bulletin
Volume37
Issue number4
DOIs
Publication statusPublished - 2011

Cite this