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Although initially considered as one dimension, there is evidence for multidimensionality within positive symptoms. The positive symptom structure has not been examined in individuals at clinical high risk (CHR) for psychosis. Knowledge of the dimensional structure of positive symptoms within CHR may contribute to our understanding of the aetiology and trajectory of this key facet of psychosis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Method<\/jats:title><jats:p>Exploratory factor analysis (EFA) was conducted on the Prodromal Questionnaire\u2010Brief for 183 individuals meeting CHR criteria. Internal consistency was examined to determine the hierarchical structure of the data and alternative models were compared.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>EFA revealed a three factor model, grouping in to: perceptual abnormalities, grandiose\/unusual delusions and persecutory\/thought delusions, with a general factor accounting for 56% of the variance. Confirmatory factor analysis showed that a hierarchical model was the best fit. One item referring to nihilistic thoughts did not load on any factor.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>There is a clear three\u2010dimensional model, distinguishing perceptual abnormalities, and two subgroups of delusions in CHR individuals. The factors are similar to those found in psychotic disorders. The identification and comparison of symptomatic models is useful given the prominent role positive symptoms play in diagnosis, and is crucial to our understanding of the clinical progression of psychosis. This work may provide a useful tool for future studies examining correlations with varying symptom factors and disease progression in CHR.<\/jats:p><\/jats:sec>","DOI":"10.1111\/eip.12969","type":"journal-article","created":{"date-parts":[[2020,4,27]],"date-time":"2020-04-27T06:59:50Z","timestamp":1587970790000},"page":"505-512","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Structure of positive psychotic symptoms in individuals at clinical high risk for psychosis"],"prefix":"10.1111","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8164-0357","authenticated-orcid":false,"given":"Matilda","family":"Azis","sequence":"first","affiliation":[{"name":"Department of Psychology Northwestern University  Illinois USA"},{"name":"Department of Psychiatry Northwestern University  Illinois USA"},{"name":"Department of Medical Social Sciences Northwestern University  Illinois USA"},{"name":"Institute for Policy Research Northwestern University  Illinois USA"},{"name":"Institute for Innovations in Developmental Sciences Northwestern University  Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pamela Rakhshan","family":"Rouhakhtar","sequence":"additional","affiliation":[{"name":"Department of Psychology University of Maryland, Baltimore County  Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jason E.","family":"Schiffman","sequence":"additional","affiliation":[{"name":"Department of Psychology University of Maryland, Baltimore County  Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lauren M.","family":"Ellman","sequence":"additional","affiliation":[{"name":"Department of Psychology Temple University  Philadelphia Pennsylvania USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gregory P.","family":"Strauss","sequence":"additional","affiliation":[{"name":"Department of Psychology University of Georgia  Athens Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vijay A.","family":"Mittal","sequence":"additional","affiliation":[{"name":"Department of Psychology Northwestern University  Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,4,26]]},"reference":[{"key":"e_1_2_6_2_1","volume-title":"Scale for the assessment of positive symptoms (SAPS)","author":"Andreasen N. 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