Criterion Validity of the WAIS-IV Cognitive Proficiency Index (CPI).
OBJECTIVE
The current study sought to validate the Cognitive Proficiency Index (CPI) against similar, well-established measures of attention and processing speed. Additionally, the sensitivity of the CPI and Attention Index of the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) and their ability to differentiate among clinical groups were compared.


METHODS
The first objective was accomplished by calculating correlation coefficients between the CPI and similar attention and processing speed measures. The second objective was accomplished using a clinical group of 25 individuals with Mini-Mental State Exam (MMSE) scores of less than or equal to 23 matched to a non-clinical group of 43 participants with MMSE scores of 30, all derived from the original sample.


RESULTS
The CPI correlated in expected ways with other measures of attention and processing speed (magnitude of r = .19-.77). ANCOVA, receiver operating characteristic, and discriminant function analyses suggested that the CPI is superior to the RBANS Attention Index in differentiating between clinical and non-clinical groups.


CONCLUSIONS
These findings provide support for convergent validity and criterion-related concurrent validity for the CPI.
a Department of Psychiatry and Behavior Sciences , University of Oklahoma Health Science Center , Oklahoma City , OK , USA.
Erin
E
Logue
a Department of Psychiatry and Behavior Sciences , University of Oklahoma Health Science Center , Oklahoma City , OK , USA.
David M
DM
Scarisbrick
b Department of Psychiatry and Behavioral Sciences , UCLA Semel Institute for Neuroscience & Human Behavior , Los Angeles , CA , USA.
Nicholas S
NS
Thaler
c Department of Psychiatry and Neurobehavioral Sciences , University of Virginia School of Medicine , Charlottesville , VA , USA.
James J
JJ
Mahoney
d Department of Physical Medicine & Rehabilitation , Baylor College of Medicine & TIRR/Memorial Hermann , Houston , TX , USA.
Cady K
CK
Block
a Department of Psychiatry and Behavior Sciences , University of Oklahoma Health Science Center , Oklahoma City , OK , USA.
Russell
R
Adams
a Department of Psychiatry and Behavior Sciences , University of Oklahoma Health Science Center , Oklahoma City , OK , USA.
James
J
Scott
D000328:Adult; D001288:Attention; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009483:Neuropsychological Tests / Q000592:standards*; D011594:Psychometrics / Q000592:standards*; D015203:Reproducibility of Results; D014888:Wechsler Scales / Q000592:standards*
Attention.; Intelligence; Neuropsychological test; Reliability and validity; Wechsler scales