The Italian Version of the Brief 21-Item Prodromal Questionnaire: Field Test, Psychometric Properties and Age-Sensitive Cut-Offs

Psychopathology
Lorenzo PelizzaAndrea Raballo

Abstract

The Brief, 21-item version of the Prodromal Questionnaire (PQ-B) is a promising screener for psychosis-risk states that could be implemented in routine clinical practice. In this study, we assessed psychometric properties of the Italian version of the PQ-B (iPQ-B) in a sample of 243 help-seekers, aged 13-35 years. After completing the iPQ-B, participants were assessed with the Comprehensive Assessment of At-Risk Mental States (CAARMS). Diagnostic accuracy (sensitivity, specificity, positive and negative predictive values [PPV and NPV], positive and negative likelihood ratios) and concurrent validity between PQ-B and CAARMS were determined using Cronbach's alpha and Cohen's kappa. We also tested the validity of the adopted PQ-B cut-offs through Receiver Operating Characteristic (ROC) curves plotted against CAARMS diagnoses and the predictive validity of the iPQ-B at 1-year follow-up. The iPQ-B showed high internal consistency (Cronbach's alpha = 0.868), acceptable diagnostic accuracy and concurrent validity (70% sensitivity, 67% specificity, 81% PPV, Cohen's kappa = 0.335). ROC analyses pointed to threshold of ≥20 on the PQ-B total distress score as best cut-off. After 12 months of follow-up, 11% of participants who scored ≥4 on...Continue Reading

Citations

Feb 29, 2020·Nordic Journal of Psychiatry·Lorenzo PelizzaAndrea Raballo
Apr 21, 2020·Early Intervention in Psychiatry·Giulia LandiLorenzo Pelizza
Nov 24, 2019·Early Intervention in Psychiatry·Emanuela LeuciLorenzo Pelizza
May 29, 2020·Early Intervention in Psychiatry·Lorenzo PelizzaAndrea Raballo
Jan 26, 2021·Frontiers in Psychiatry·Michele PolettiLorenzo Pelizza
Nov 20, 2021·Journal of Clinical Psychology·Lorenzo PelizzaAndrea Raballo

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