Nithsdale Schizophrenia Surveys 21: a longitudinal study of National Adult Reading Test stability

Background. The stability of the National Adult Reading Test (NART) as a measure of pre-morbid intelligence in schizophrenia has not yet been satisfactorily established despite the widespread use of the NART in schizophrenia research. Method. We examined NART stability in a diverse group of 45 schiz...

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Bibliographic Details
Published in:Psychological medicine 2000-05, Vol.30 (3), p.717-720
Main Authors: MORRISON, G., SHARKEY, V., ALLARDYCE, J., KELLY, R. C., McCREADIE, R. G.
Format: Article
Language:English
Subjects:
Adolescent
Adult
BRIEF COMMUNICATION
Dyslexia - diagnosis
Estimates
Female
Humans
Intelligence quotient
Intelligence Tests - standards
Intelligence Tests - statistics & numerical data
Longitudinal studies
Male
Middle Aged
National Adult Reading Test
Patients
Premorbid
Reproducibility of Results
Schizophrenia
Schizophrenia - complications
Schizophrenia - diagnosis
Sensitivity and Specificity
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Summary:Background. The stability of the National Adult Reading Test (NART) as a measure of pre-morbid intelligence in schizophrenia has not yet been satisfactorily established despite the widespread use of the NART in schizophrenia research. Method. We examined NART stability in a diverse group of 45 schizophrenic patients in a prospective longitudinal study over 6·5–7·5 years. Results. The results showed that NART performance does not decline significantly with increasing duration of schizophrenic illness and that test–retest reliability, even over 6·5–7·5 years, is extremely high. Discussion. Our results provide the necessary evidence that the NART can be used as a stable measure of pre-morbid intelligence in schizophrenia.
ISSN:0033-2917
1469-8978
DOI:10.1017/S0033291799001920