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Intellectual differences between schizophrenic patients and normal controls across the adult lifespan

Kondel, TK; Mortimer, AM; Leeson, VC; Laws, KR; Hirsch, SR; (2003) Intellectual differences between schizophrenic patients and normal controls across the adult lifespan. J CLIN EXP NEUROPSYC , 25 (8) 1045 - 1056.

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Abstract

A debate persists about whether IQ declines during the duration of schizophrenia or whether an early deficit remains static across the lifespan. To examine this, we measured estimated current IQ (Quick Test Revised: QTR) and estimated premorbid IQ (National Adult Reading Test: NART) in schizophrenic patients (n = 110) and matched healthy controls (n = 71) across a wide age range (20-88). Age correlated negatively with NART and QTR IQ for schizophrenic patients, but not for controls. A subset of 23 schizophrenic patients was also retested on the NART after 4 years to determine NART stability and they showed no significant change. We propose that the lower NART IQ in older patients reflects a lower 'starting point' and that this may be related to lower educational opportunities in older patients.

Type: Article
Title: Intellectual differences between schizophrenic patients and normal controls across the adult lifespan
Keywords: READING TEST, PREMORBID INTELLIGENCE, NART, ABILITY, AGE, IQ
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Clinical, Edu and Hlth Psychology
URI: http://discovery.ucl.ac.uk/id/eprint/127784
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