14:15 Persistence of the Extended Psychosis Phenotype in Young People: Link Between Vulnerability and Clinical Need

Wigman, lohanna T.W.; Vollebergh, Wilma; Yung, Alison; Thiery, Evert; Derom, Caterine; Os, Jim van

doi:10.1016/s0920-9964(12)70265-7

Cited by 2 publications

(2 citation statements)

References 171 publications

(416 reference statements)

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“…There is increasing evidence supporting a continuous view on psychosis (Van Os et al ., , , ; Johns and Van Os, ; Hanssen, ; Wigman, ). This continuum of psychotic severity ranges from normality through schizotypy to full blown clinical psychotic disorder.…”

Section: Introductionmentioning

confidence: 99%

The Prodromal Questionnaire: a case for IRT-based adaptive testing of psychotic experiences?

Bebber

Wigman

Meijer

et al. 2016

Int J Methods Psychiatr Res

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Computerized adaptive tests (CATs) for positive and negative psychotic experiences were developed and tested in N = 5705 help-seeking, non-psychotic young individuals. Instead of presenting all items, CATs choose a varying number of different items during test administration depending on respondents' previous answers, reducing the average number of items while still obtaining accurate person estimates. We assessed the appropriateness of two-parameter logistic models to positive and negative symptoms of the Prodromal Questionnaire (PQ), computed measurement precision of all items and resulting adaptive tests along psychotic dimensions by Real Data Simulations (RDS), and computed indices for criterion and predictive validities of the CATs. For all items, mean absolute differences between observed and expected response probabilities were smaller than 0.02. CAT-POS predicted transition to psychosis and duration of hospitalization in individuals at-risk for psychosis, and CAT-NEG was suggestively related to later functioning. Regarding psychosis risk classifications of help-seeking individuals, CAT-POS performed less than the PQ-16. Adaptive testing based on self-reported positive and negative symptoms in individuals at-risk for psychosis is a feasible method to select patients for further risk classification. These promising findings need to be replicated prospectively in a non-selective sample that also includes non-at-risk individuals. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

The Prodromal Questionnaire: a case for IRT-based adaptive testing of psychotic experiences?

Bebber

Wigman

Meijer

et al. 2016

Int J Methods Psychiatr Res

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“…Subclinical psychotic experiences form a paradox [12,13]. On the one hand, psychotic experiences are relatively prevalent in the general population, with the majority of experiences being transient [8,9,14,15].…”

Section: Introductionmentioning

confidence: 99%

Dimensional and discrete variations on the psychosis continuum in a Dutch crowd-sourcing population sample

et al. 2017

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Subclinical psychotic experiences show both dimensional severity variations and discrete symptom-pattern variations across individuals. To understand and capture all interindividual variations in subclinical psychotic experiences, their number, nature and context (co-occurrence patterns) should be considered at the same time. Only some psychotic experiences may lay on a true psychopathological psychosis continuum.

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14:15 Persistence of the Extended Psychosis Phenotype in Young People: Link Between Vulnerability and Clinical Need

Cited by 2 publications

References 171 publications

The Prodromal Questionnaire: a case for IRT-based adaptive testing of psychotic experiences?

The Prodromal Questionnaire: a case for IRT-based adaptive testing of psychotic experiences?

Dimensional and discrete variations on the psychosis continuum in a Dutch crowd-sourcing population sample

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