The frankfurt complaint questionnaire for self-assessment of basic symptoms in the early detection of psychosis-factor structure, reliability, and predictive validity

Uttinger, Martina; Studerus, Erich; Ittig, Sarah; Heitz, Ulrike; Schultze-Lutter, Frauke; Riecher-Rössler, Anita (2018). The frankfurt complaint questionnaire for self-assessment of basic symptoms in the early detection of psychosis-factor structure, reliability, and predictive validity. International Journal of Methods in Psychiatric Research, 27(2), e1600. Wiley 10.1002/mpr.1600

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OBJECTIVES: Patients with schizophrenia often experience subtle disturbances in several domains of information processing-so-called basic symptoms (BS). BS are already present before onset of frank psychosis and can be assessed by interviews but also by the self-administered Frankfurt Complaint Questionnaire (FCQ). We investigated the factor structure, reliability, and predictive validity for transition to psychosis of the FCQ, comparing previously proposed factor solutions containing 1, 2, 4, and 10 factors. METHODS: Confirmatory factor analysis was used in a sample of 117 at-risk mental state and 92 first-episode psychosis participants of the Basel FePsy (early detection of psychosis) study. RESULTS: Although all factor models fitted to the data, the 2- or 4-factor solutions performed best among the models that used at least half of the FCQ items, suggesting the covariance between FCQ items is best explained by 2 to 4 underlying factors. No FCQ-scale predicted transition to psychosis. CONCLUSION: We could confirm a 2- to 4-factor structure of the FCQ in a sample of at-risk mental state and first-episode psychosis patients using confirmatory factor analysis. Contrary to interview-assessed cognitive-perceptive BS, self-assessed BS do not seem to improve prediction of psychosis. This result reinforces reports of poor correspondence between interview- and questionnaire-assessed BS.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > University Psychiatric Services > University Hospital of Child and Adolescent Psychiatry and Psychotherapy
04 Faculty of Medicine > University Psychiatric Services > University Hospital of Child and Adolescent Psychiatry and Psychotherapy > Research Division

UniBE Contributor:

Schultze-Lutter, Frauke

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1049-8931

Publisher:

Wiley

Language:

English

Submitter:

Livia Hug

Date Deposited:

06 Mar 2018 14:29

Last Modified:

24 Oct 2019 21:51

Publisher DOI:

10.1002/mpr.1600

PubMed ID:

29266529

Uncontrolled Keywords:

Frankfurt Complaint Questionnaire, basic symptoms, confirmatory factor analysis, prediction of psychosis, self-assessment

BORIS DOI:

10.7892/boris.109308

URI:

https://boris.unibe.ch/id/eprint/109308

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