{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T21:05:28Z","timestamp":1791925528290,"version":"4.3.4"},"reference-count":0,"publisher":"Cambridge University Press (CUP)","issue":"4","license":[{"start":{"date-parts":[[1998,7,1]],"date-time":"1998-07-01T00:00:00Z","timestamp":899251200000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Psychol. Med."],"published-print":{"date-parts":[[1998,7]]},"abstract":"<jats:p><jats:bold>Background.<\/jats:bold> Recent research has focused upon the \nsubdiagnostic level in an effort to derive more \nvalid domains of psychotic disorder. This has led to the influential \npositive\u2013negative dichotomy in \nschizophrenia being superseded by a three-syndrome model. The \nstrategy of looking for syndromes \nwithin poorly validated diagnostic categories, such as schizophrenia, \nhas limitations, particularly \nsince it originated in, and has been largely restricted to, the more chronic\n subsamples.<\/jats:p><jats:p><jats:bold>Method.<\/jats:bold> A representative sample of first episode psychosis\n \n(<jats:italic>N<\/jats:italic>=509), which includes the full \nspectrum of functional psychosis, was utilized to re-examine the \ndimensional structure of functional \npsychosis from first principles. Patients were assessed with the Royal\n Park Multidiagnostic \nInstrument for Psychosis (MIP), a comprehensive procedure that documents\n the psychopathology \nof the first episode in a clinically valid manner.<\/jats:p><jats:p><jats:bold>Results.<\/jats:bold> Principal axis factor analysis was carried \nout on the tetrachoric correlation matrix of 92 \ncore psychopathological items. A robust and clinically valid four-factor\n solution was obtained, \ncomprising depression, mania and only two other factors. The first was\n a Bleulerian blend of \nnegative symptoms, catatonic\/motor symptoms and disorganization. The\n second was \na combination of Schneiderian first rank symptoms, and other hallucinations\n \nand delusions. The data thus failed \nto support the three-syndrome model for non-affective symptoms in this\n population. A six-factor \nsolution, although partially consistent with other studies, represented\n a more complex and \nconfusing elaboration of the more clinically valid four-factor solution.<\/jats:p><jats:p><jats:bold>Conclusions.<\/jats:bold> The findings have implications for \nthe conceptualization of early psychosis, which \nneed to be explored further in validation studies.<\/jats:p>","DOI":"10.1017\/s0033291798006771","type":"journal-article","created":{"date-parts":[[2002,7,27]],"date-time":"2002-07-27T13:36:08Z","timestamp":1027776968000},"page":"935-947","source":"Crossref","is-referenced-by-count":118,"title":["The dimensional structure of first episode psychosis: an exploratory\n factor \nanalysis"],"prefix":"10.1017","volume":"28","author":[{"given":"P. D.","family":"McGORRY","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R. C.","family":"BELL","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P. L.","family":"DUDGEON","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. J.","family":"JACKSON","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[1998,7,1]]},"container-title":["Psychological Medicine"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.cambridge.org\/core\/services\/aop-cambridge-core\/content\/view\/S0033291798006771","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2019,4,3]],"date-time":"2019-04-03T19:40:23Z","timestamp":1554320423000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.cambridge.org\/core\/product\/identifier\/S0033291798006771\/type\/journal_article"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1998,7]]},"references-count":0,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1998,7]]}},"alternative-id":["S0033291798006771"],"URL":"https:\/\/doi.org\/10.1017\/s0033291798006771","relation":{},"ISSN":["0033-2917","1469-8978"],"issn-type":[{"value":"0033-2917","type":"print"},{"value":"1469-8978","type":"electronic"}],"subject":[],"published":{"date-parts":[[1998,7]]}}}