Estimating premorbid IQ from demographic variables: Regression equations derived from a UK sample

J. R. Crawford, L. E. Stewart, R. H.B. Cochrane, J. A. Foulds, J. A.O. Besson, D. M. Parker

Research output: Contribution to journalArticlepeer-review

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Abstract

The purpose of the study reported here was to build regression equations for the estimation of premorbid IQ from demographic variables in a UK population. Subjects (n = 151) free of neurological, psychiatric or sensory disability, were administered the Wechsler Adult Intelligence Scale (WAIS) and had their demographic details recorded (age, sex, occupation and education). WAIS Full Scale (FSIQ), Verbal (VIQ), and Performance IQ (PIQ) were regressed on the demographic variables. The regression equations generated by this procedure predicted 50, 50, and 30 per cent of the variance in FSIQ, VIQ, and PIQ respectively. These equations should provide a convenient and useful supplement to psychometric estimates of premorbid IQ. Unlike psychometric estimates, demographic estimates are entirely independent of a patient's current cognitive status. 1989 The British Psychological Society

Original languageEnglish (US)
Pages (from-to)275-278
Number of pages4
JournalBritish Journal of Clinical Psychology
Volume28
Issue number3
DOIs
StatePublished - Sep 1989

All Science Journal Classification (ASJC) codes

  • Clinical Psychology

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