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Social Psychiatry and Psychiatric Epidemiology
Published in: Social Psychiatry and Psychiatric Epidemiology 4/2012

01-04-2012 | Original Paper

A semi-structured clinical interview for psychosis sub-groups (SCIPS): development and psychometric properties

Authors: Yoshihiro Kinoshita, David Kingdon, Kuni Kinoshita, Sheeba Sarafudheen, Deepa Umadi, David Dayson, Lars Hansen, Shanaya Rathod, Richard B. Ibbotson, Douglas Turkington, Toshi A. Furukawa

Published in: Social Psychiatry and Psychiatric Epidemiology | Issue 4/2012

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Abstract

Background

Clinical sub-groups of schizophrenia, namely drug related, traumatic, anxiety and stress sensitivity sub-types, have been proposed for use in research, training and practice. They were developed on the basis of clinical observation but have not yet been used in research or clinical practice to any great extent.

Aims

To develop a semi-structured clinical interview for psychosis sub-groups (SCIPS) and determine the best diagnostic criteria with the highest inter-rater reliability, test–retest reliability and concurrent validity for sub-grouping patients with schizophrenia according to a newly developed classification scheme.

Methods

The SCIPS was developed based upon discussion with the clinician researchers who had developed and were using the sub-groups. Kappa coefficients were calculated between two independent diagnostic assessments with the SCIPS (for inter-rater reliability and test–retest reliability, n = 20) and between the SCIPS diagnosis and the sub-groupings as determined independently with highest achievable validity (for concurrent validity, n = 21) for patients with schizophrenia. These inter-rater reliability and concurrent validity were compared among five different sets of diagnostic criteria to determine which was most reliable and valid.

Results

A set of diagnostic criteria with the highest inter-rater reliability and concurrent validity was determined. Kappa coefficients (95% confidence interval) for the inter-rater reliability and concurrent validity were 0.93 (0.66–1.20) and 0.73 (0.47–1.00), respectively, with these diagnostic criteria.

Conclusions

The SCIPS is a promising tool with which to sub-group patients with schizophrenia according to this recently developed classification scheme. The semi-structured interview achieves acceptable inter-rater and test–retest reliability and concurrent validity.
Appendix
Available only for authorised users
Footnotes
1
Any other kinds of drugs which are proved to cause psychotic symptoms (e.g., diethylpropion) can be included.
 
2
Mode of onset is defined as the period between the first reported symptom or noticeable behavioural change and the patient’s subjective peak of the first episode. In this case, ‘acute’ onset means less than 1 month, while ‘insidious’ onset means equal to or more than 1 month.
 
3
‘Stress sensitive’ means that emotional reactivity is high to daily life stress, or ‘daily hassles’ [40, 41].
 
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Metadata
Title
A semi-structured clinical interview for psychosis sub-groups (SCIPS): development and psychometric properties
Authors
Yoshihiro Kinoshita
David Kingdon
Kuni Kinoshita
Sheeba Sarafudheen
Deepa Umadi
David Dayson
Lars Hansen
Shanaya Rathod
Richard B. Ibbotson
Douglas Turkington
Toshi A. Furukawa
Publication date
01-04-2012
Publisher
Springer-Verlag
Published in
Social Psychiatry and Psychiatric Epidemiology / Issue 4/2012
Print ISSN: 0933-7954
Electronic ISSN: 1433-9285
DOI
https://doi.org/10.1007/s00127-011-0357-9

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