Abstract
This study examined the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) Cognitive Proficiency Index (CPI) in relation to other WAIS-IV indices, overall test battery mean (OTBM), and impairment (IMP) in an outpatient rehabilitation setting. Participants (N = 329) were 35% female and 88% Caucasian with average age and education of 42.9 (SD = 13.5) and 13.6 (SD = 2.4) years, respectively. Participants were grouped by diagnosis and validity: traumatic brain injury (TBI; n = 176; 39% mild), cerebrovascular accident (CVA; n = 52), other neurologic and psychiatric conditions (OTH; n = 49), and questionable performance validity (QPV; n = 52). OTBM was calculated from non-WAIS-IV tests; IMP was dichotomously defined as four or more non-WAIS-IV scores below cutoff (≤35 T). Significant group differences were observed on CPI, WAIS-IV indices, OTBM, and IMP. CPI significantly contributed (β =.51) to a linear regression model predicting OTBM (R 2 =.63) with education and GAI as covariates. A logistic regression model with IMP as the outcome and education, GAI, and CPI as predictors correctly classified 80% of cases with area under the curve of.86. A previously identified cutoff (CPI < 84) correctly classified 65–78% of clinical groups categorized by IMP. A novel cutoff (CPI ≤ 80) differentiated clinical participants with history of mild TBI from the QPV group with sensitivity of 44.2% and specificity of 89.7%. CPI showed incremental validity in predicting OTBM and IMP and warrants further study as a useful clinical addition to other WAIS-IV indices.
Original language | English (US) |
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Pages (from-to) | 573-582 |
Number of pages | 10 |
Journal | Applied neuropsychology. Adult |
Volume | 28 |
Issue number | 5 |
DOIs | |
State | Published - 2021 |
Externally published | Yes |
Keywords
- Cognitive proficiency
- WAIS-IV
- rehabilitation
- stroke
- traumatic brain injury
ASJC Scopus subject areas
- Neuropsychology and Physiological Psychology
- Developmental and Educational Psychology