ISSN 2043-8087
Journal of Experimental Psychopathology
 Volume 3, Issue 4, 582-593, 2012
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Assessing Levels of Subthreshold Psychotic Symptoms in the Recovery Phase: the Schizotypal Symptoms Inventory (SSI)

Authors
Jo Hodgekins (a), Sian Coker (a), Daniel Freeman (b), Katarzyna Ray-Glover(c), Paul Bebbington (d), Philippa Garety (e), Elizabeth Kuipers (e), Graham Dunn (f), David Fowler (a)
(a) Department of Psychological Sciences, Norwich Medical School, University of East Anglia, Norwich, UK.
(b) Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX
(c) Department of Biostatistics and Computing, Institute of Psychiatry, King's College London, Denmark Hill, London, UK.
(d) Department of Mental Health Sciences, Royal Free and University College Medical School, University College London, UK.
(e) Department of Psychology, Institute of Psychiatry, King's College London, Denmark Hill, London, UK.
(f) School of Community Based Medicine, University of Manchester, Manchester, UK.

Volume 3, Issue 4, 2012, Pages 582-593
DOI: http://dx.doi.org/10.5127/jep.021211

Abstract
Objective: Subthreshold psychotic symptoms occurring during the recovery stages of psychosis may impede social functioning and precipitate relapse. Traditional assessment tools lack adequate sensitivity to assess such phenomena. The study aim was to develop a comprehensive self-report measure of residual psychotic symptoms.
Method: The psychometric properties of the Schizotypal Symptoms Inventory (SSI) were analysed in a sample of 808 students and a sample of 126 clinical cases recovering from psychosis. Levels of schizotypal symptoms were compared between the two groups.
Results: The SSI was shown to have good psychometric properties. The clinical sample had higher scores on all dimensions of the SSI than the non-clinical sample. Social anxiety symptoms were particularly prevalent in the recovery phase.
Conclusions: Individuals recovering from acute psychosis experience high levels of subthreshold psychotic symptoms which may impede long-term recovery. The SSI has robust psychometric properties and could be used to assess these phenomena.

Table of Contents
Introduction
  Aims of the Study
Methods
  Participants and Procedure
    Non-clinical sample
    Clinical sample
  Measures
  Statistical Analyses
Results
  Sample Description
  Psychometric analysis of the SSI
    Discriminative ability
    Reliability and validity
    Dimensionality
    Comparison of factor scores in the non-clinical and clinical samples
  Creation of a Brief Version of the SSI
    Descriptive statistics of the Brief SSI
    Psychometric analysis of the Brief SSI
  Prevalence of Schizotypal Symptoms in Clinical and Non-Clinical Samples
  Distributions of Trait and State Symptom Counts
Discussion
Acknowledgements
References

Correspondence to
Jo Hodgekins, Norwich Medical School, Health Policy and Practice, University of East Anglia, Norwich, NR4 7TJ.

Keywords
Psychosis, Schizotypal Symptoms, Recovery

Dates
Received 22 Jun 2011; Revised 8 Feb 2012; Accepted 8 Feb 2012; In Press 23 Sep 2012







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