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Nithsdale schizophrenia surveys 21: a longitudinal study of National Adult Reading Test stability
G Morrison1, V Sharkey, J Allardyce
1Department of Clinical Research, Crichton Royal Hospital, Dumfries, Scotland.
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.