Comparison of NART and Barona demographic equation premorbid IQ estimates in Alzheimer's disease

• Published in: Journal of clinical psychology Vol. 53; no. 7; pp. 713 - 722
• Main Authors: Paolo, Anthony M., Tröster, Alexander I., Ryan, Joseph J., Koller, William C.
• Format: Journal Article
• Language: English
• Published: Brandon Wiley Subscription Services, Inc., A Wiley Company 01.11.1997; Wiley Periodicals Inc
• Subjects: Aged; Aged, 80 and over; Alzheimer Disease - psychology; Alzheimer's disease; Demography; Female; Humans; Intelligence; Intelligence tests; Male; Mathematical Computing; Neuropsychological Tests - standards; Psychology; Sensitivity and Specificity
• ISSN: 0021-9762; 1097-4679
• DOI: 10.1002/(SICI)1097-4679(199711)53:7<713::AID-JCLP8>3.0.CO;2-I

Two methods of estimating premorbid WAIS‐R intelligence were compared in matched samples of normal and AD persons. The NART and Barona 1984 demographic equations accurately predicted the IQs of the normal group and overestimated the IQs of the AD subjects. When the AD group was divided into mild and moderately impaired subgroups, the more severely demented subjects displayed lower WAIS‐R IQs and NART estimated IQs, revealing that NART performance is sensitive to dementia severity. However, the NART estimated IQs for the mild and moderately impaired AD subgroups were larger than the WAIS‐R IQs, suggesting that while the NART is sensitive to dementia severity, it may still provide relevant clinical information. © 1997 John Wiley & Sons, Inc. J Clin Psychol 53: 713–722, 1997.