TY - JOUR
T1 - The Prodromal Questionnaire: a case for IRT-based adaptive testing of psychotic experiences?
T2 - a case for IRT-based adaptive testing of psychotic experiences?
AU - van Bebber, Jan
AU - Wigman, Johanna T. W.
AU - Meijer, Rob R.
AU - Ising, Helga K.
AU - van den Berg, David
AU - Rietdijk, Judith
AU - Dragt, Sara
AU - Klaassen, Rianne
AU - Nieman, Dorien
AU - de Jonge, Peter
AU - Sytema, Sjoerd
AU - Wichers, Marieke
AU - Linszen, Don
AU - van der Gaag, Mark
AU - Wunderink, Lex
PY - 2017/6/1
Y1 - 2017/6/1
N2 - 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 (c) 2016 John Wiley & Sons, Ltd
AB - 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 (c) 2016 John Wiley & Sons, Ltd
KW - computerized adaptive tests
KW - item response theory
KW - psychosis
KW - real data simulations
UR - http://www.scopus.com/inward/record.url?scp=84994422948&partnerID=8YFLogxK
U2 - https://doi.org/10.1002/mpr.1518
DO - https://doi.org/10.1002/mpr.1518
M3 - Article
C2 - 27468957
SN - 1049-8931
VL - 26
SP - e1518
JO - International journal of methods in psychiatric research
JF - International journal of methods in psychiatric research
IS - 2
M1 - e1518
ER -