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Using word recognition tests to estimate premorbid IQ in early dementia: longitudinal data
G E Smith1, D L Bohac, R J Ivnik
1Psychology Division, Mayo Clinic, Rochester, MN 55905, USA. smitg@mayo.edu
Journal of the International Neuropsychological Society : JINS
|February 4, 1998
Summary
Word recognition scores can estimate past Verbal IQ, but may overestimate. A revised equation improved accuracy for normal individuals and those with cognitive impairment.
Area of Science:
- Neuropsychology
- Cognitive Science
Background:
- Estimating past cognitive function is crucial for tracking cognitive decline.
- Word recognition tests offer a potential proxy for verbal intelligence.
Purpose of the Study:
- To evaluate the accuracy of word recognition scores in estimating prior Verbal IQ.
- To develop a revised prediction equation for improved accuracy.
Main Methods:
- Utilized data from 271 cognitively normal individuals and 24 who developed impairment.
- Employed a regression equation based on education and the National Adult Reading Test (NART).
- Developed and validated a revised prediction equation.
Main Results:
- The initial prediction equation correlated well (r=0.7) but overestimated obtained Verbal IQ scores.
- The revised equation demonstrated improved prediction accuracy in the normal sample.
- Revised predictions provided reasonable estimates of initial Verbal IQ in individuals who later developed cognitive impairment.
Conclusions:
- Word recognition scores, particularly with a revised equation, can be useful for estimating past Verbal IQ.
- The findings aid in clinical interpretation of cognitive assessments.
- This method supports longitudinal cognitive assessment and monitoring.