Actual and clinician-predicted IOP-29 scores in a clinical setting

Bibliographic Data

ID21294064
AuthorsJamie Berry (0000-0001-6560-2457, Macquarie University, corresponding author), E Arthur Shores (0000-0003-1553-5131, Macquarie University), Jennifer Batchelor (0000-0003-4438-4993, Macquarie University)
Year2026
Pages1-10
Publication date2026-06-08
Open AccessYes
TypeARTICLE
VenueAustralian Psychologist (JOURNAL)
Journal identifiersISSN: 0005-0067 • E-ISSN: 1742-9544
PublisherInforma UK Limited (PUBLISHER • GB)
DOI10.1080/00050067.2026.2683188
OpenAlexW7163906080
LanguageEN
References cited39

Objective Clinicians often rely on judgement rather than validated tools to assess symptom credibility. Understanding how clinical judgement compares to objective measures is crucial, as self-reported symptoms can significantly influence diagnosis and treatment.Method Eleven clinicians from a group private practice were asked to predict the IOP-29 False Disorder Probability Score (FDS) for n = 154 non-litigants seen for neuropsychological assessment, based on their judgement of the examinee’s self-report credibility. These predictions were compared to actual IOP-29 FDS scores using different cut-offs. Test-operating characteristics of clinician-predicted versus actual IOP-29 FDS scores were calculated for the three cut-offs, and secondary analyses examined the effect of culturally and linguistically diverse (CALD) status on prediction accuracy.Results Cohen’s Kappa (.08, −.07 – .24) and intra-class correlation (ICC = .33, .18–.46) values showed poor agreement between clinician-predicted and actual IOP-29 FDS scores. Although the specificity was acceptable (90.7%, 83.6–95.5), sensitivity of the clinical judgement of symptom validity was low (19.6%, 9.4–33.9). CALD status had no bearing on FDS prediction accuracy.Conclusions Clinicians are unable to accurately judge the validity of symptom reporting relative to a validated symptom validity measure, highlighting the need to administer such measures routinely in clinical practice

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