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Pronunciation of irregular words is preserved in dementia, validating premorbid IQ estimation

From the Departments of Geriatric Medicine (Drs. McGurn and Starr) and Psychology (Drs. McGurn, Whiteman, and Deary, and A. Pattie), University of Edinburgh; Lothian Memory Treatment Centre (J.A. Topfer), Edinburgh; and Department of Mental Health (Dr. Whalley, H.A. Lemmon), University of Aberdeen, UK.

Address correspondence and reprint requests to Professor I.J. Deary, Department of Psychology, University of Edinburgh, 7 George Square, Edinburgh EH8 9JZ, UK; e-mail: I.Deary{at}ed.ac.uk

The National Adult Reading Test (NART), used to estimate premorbid mental ability, involves pronunciation of irregular words. The authors demonstrate that, after controlling for age 11 IQ test scores, mean NART scores do not differ in people with and without dementia. The correlation between age 11 IQ and NART scores at about age 80 was similar in the groups with (r = 0.63, p < 0.001) and without (r = 0.60, p < 0.001) dementia. These findings validate the NART as an estimator of premorbid ability in mild to moderate dementia.

Received April 18, 2003. Accepted in final form September 17, 2003.

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