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The revised Green etal., ParanoidThoughts Scale(R-GPTS):psychometricproperties, severityranges, and clinicalcut-offs Daniel FreemanBao Sheng LoeDavid Kingdon2019 год

The revised Green et al., Paranoid Thoughts Scale (R-GPTS): psychometric properties, severity ranges, and clinical cut-offs
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Аннотация: Abstract Background The Green et al ., Paranoid Thoughts Scale (GPTS) – comprising two 16-item scales assessing ideas of reference (Part A) and ideas of persecution (Part B) – was developed over a decade ago. Our aim was to conduct the first large-scale psychometric evaluation. Methods In total, 10 551 individuals provided GPTS data. Four hundred and twenty-two patients with psychosis and 805 non-clinical individuals completed GPTS Parts A and B. An additional 1743 patients with psychosis and 7581 non-clinical individuals completed GPTS Part B. Factor analysis, item response theory, and receiver operating characteristic analyses were conducted. Results The original two-factor structure of the GPTS had an inadequate model fit: Part A did not form a unidimensional scale and multiple items were locally dependant. A Revised-GPTS (R-GPTS) was formed, comprising eight-item ideas of reference and 10-item ideas of persecution subscales, which had an excellent model fit. All items in the new Reference ( a = 2.09–3.67) and Persecution ( a = 2.37–4.38) scales were strongly discriminative of shifts in paranoia and had high reliability across the spectrum of severity ( a > 0.90). The R-GPTS score ranges are: average (Reference: 0–9; Persecution: 0–4); elevated (Reference: 10–15; Persecution: 5–10); moderately severe (Reference: 16–20; Persecution:11–17); severe (Reference: 21–24; Persecution: 18–27); and very severe (Reference: 25+; Persecution: 28+). Recommended cut-offs on the persecution scale are 11 to discriminate clinical levels of persecutory ideation and 18 for a likely persecutory delusion. Conclusions The psychometric evaluation indicated a need to improve the GPTS. The R-GPTS is a more precise measure, has excellent psychometric properties, and is recommended for future studies of paranoia.
Год издания: 2019
Авторы: Daniel Freeman, Bao Sheng Loe, David Kingdon, Helen Startup, Andrew Molodynski, Laina Rosebrock, Poppy Brown, Bryony Sheaves, Felicity Waite, Jessica C. Bird
Издательство: Cambridge University Press
Источник: Psychological Medicine
Ключевые слова: Schizophrenia research and treatment, Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes, Psychosomatic Disorders and Their Treatments
Другие ссылки: Psychological Medicine (PDF)
Psychological Medicine (HTML)
Oxford University Research Archive (ORA) (University of Oxford) (PDF)
Oxford University Research Archive (ORA) (University of Oxford) (HTML)
PubMed Central (HTML)
ePrints Soton (University of Southampton) (HTML)
PubMed (HTML)