Prior research has shown the utility of the Grooved Pegboard (GPB) as a reliable indicator of performance validity, although studies are limited to populations without cognitive impairment. The present study aimed to examine the GPB as an embedded performance validity test (PVT) in a mixed clinical sample of individuals with and without cognitive impairment. The study comprised of 250 adults referred for outpatient neuropsychological evaluation. To compute classification accuracy against the GPB raw and T-scores, patients were also administered five independent criterion PVTs for establishing valid (n=199) and invalid (n=51) groups. Across the overall sample, only the GPB dominant-hand raw score had acceptable classification accuracy (AUC=.71), with an optimal cut-score of ≥122 seconds (33% sensitivity/90% specificity). The nondominant-hand raw score and both hand T-scores were not able to reliably detect invalid performance (AUCs=.65-.69). Results provide minimal support for the clinical utility of the GPB as an embedded PVT, specifically with only a single index derived from dominant hand performance showing acceptable classification. Therefore, clinicians should be cautious with using the other scores among adults of a mixed clinical sample.
|First Author||Fini Chang|
|Second Author||Phoebe Ka Yin Tse|
|Third Author||Humza Khan|
|Fourth Author||Gabriel P. Ovsiew|
|Fifth Author||Zachary J. Resch|
|Sixth Author||Jason R. Soble|