The Schizophrenia Proneness Instrument, Child and Youth version (SPI-CY): Practicability and discriminative validity

Fux, Lucien; Walger, Petra; Schimmelmann, Benno G.; Schultze-Lutter, Frauke (2013). The Schizophrenia Proneness Instrument, Child and Youth version (SPI-CY): Practicability and discriminative validity. Schizophrenia Research, 146(1), pp. 69-78. Elsevier 10.1016/j.schres.2013.02.014

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Background

Basic symptom (BS) criteria have been suggested to complement ultra-high risk (UHR) criteria in the early detection of psychosis in adults and in children and adolescents. To account for potential developmental particularities and a different clustering of BS in children and adolescents, the Schizophrenia Proneness Instrument, Child and Youth version (SPI-CY) was developed.

Aims

The SPI-CY was evaluated for its practicability and discriminative validity.

Method

The SPI-CY was administered to 3 groups of children and adolescents (mean age 16; range=8–18; 61% male): 23 at-risk patients meeting UHR and/or BS criteria (AtRisk), 22 clinical controls (CC), and 19 children and adolescents from the general population (GPS) matched to AtRisk in age, gender, and education. We expected AtRisk to score highest on the SPI-CY, and GPS lowest.

Results

The groups differed significantly on all 4 SPI-CY subscales. Pairwise post-hoc comparisons confirmed our expectations for all subscales and, at least on a descriptive level, most items. Pairwise subscale differences indicated at least moderate group effects (r≥0.37) which were largest for Adynamia (0.52≤r≥0.70). Adynamia also performed excellent to outstanding in ROC analyses (0.813≤AUC≥0.981).

Conclusion

The SPI-CY could be a helpful tool for detecting and assessing BS in the psychosis spectrum in children and adolescents, by whom it was well received. Furthermore, its subscales possess good discriminative validity. However, these results require validation in a larger sample, and the psychosis-predictive ability of the subscales in different age groups, especially the role of Adynamia, will have to be explored in longitudinal studies.

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:	Schimmelmann, Benno Karl Edgar, Schultze-Lutter, Frauke
Subjects:	100 Philosophy > 150 Psychology 600 Technology > 610 Medicine & health
ISSN:	0920-9964
Publisher:	Elsevier
Language:	English
Submitter:	Myriam Pyrlik
Date Deposited:	04 Oct 2013 14:36
Last Modified:	05 Dec 2022 14:11
Publisher DOI:	10.1016/j.schres.2013.02.014
PubMed ID:	23473813
Web of Science ID:	000317336500012
Uncontrolled Keywords:	Basic symptoms, At-risk mental states, Psychosis, Early detection, Children and adolescents
URI:	https://boris.unibe.ch/id/eprint/14632 (FactScience: 221705)