Using word recognition tests to estimate premorbid IQ in early dementia: Longitudinal data

Glenn E. Smith, Daryl L. Bohac, Robert J. Ivnik, James F. Malec

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

This study examined the utility of word recognition scores for estimating actual Verbal IQ scores obtained from 1-5 years earlier. Participants were 271 persons remaining normal and 24 initially normal persons who developed cognitive impairment over longitudinal follow-up. A previously published regression equation based on education and the American modification of the National Adult Reading Test was used to estimate Mayo Verbal IQ. In spite of correlating well with prior obtained scores (r = .7) the predicted score tended to overestimate the obtained Mayo Verbal IQ. A revised equation was developed in the normal sample, which improved accuracy of prediction. Among the 24 persons who developed cognitive impairment over a 5-year span, the revised predicted scores provided reasonable estimates of initial Mayo Verbal IQ. To aid in clinical interpretation, a table of the normal frequencies of predicted Mayo Verbal IQ minus contemporaneously obtained Mayo Verbal IQ is provided.

Original languageEnglish (US)
Pages (from-to)528-533
Number of pages6
JournalJournal of the International Neuropsychological Society
Volume3
Issue number6
DOIs
StatePublished - Nov 1997

Keywords

  • Dementia
  • Premorbid IQ
  • Word recognition

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Psychology
  • Clinical Neurology
  • Psychiatry and Mental health

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