© 2000 The Royal College of Psychiatrists
Factor structure and familiality of first-rank symptoms in sibling pairs with schizophrenia and schizoaffective disorder
Prince of Wales Centre, University Department of Psychiatry, Warneford Hospital, Oxford
Department of Psychiatry and Behavioral Sciences, State University of New York at Stony Brook, New York, USA
Correspondence: Dr T. J. Crow, Department of Psychiatry, Warneford Hospital, Oxford OX37JX. Tel : 01865226474
Declaration of interest The work was supported by grant ROI MH 44245from the United States National Institute of Mental Health.
Background Since their introduction as diagnostic criteria by Schneider in 1937, nuclear symptoms have played a key role in concepts of schizophrenia, but their relationship to each other and to genetic predisposition has been unclear.
Aims To ascertain the factor structure and familiality of nuclear symptoms.
Methods Nuclear (Schneiderian) symptoms were extracted from case notes and interviews in a study of 103 sibling pairs with DSM-III-R schizophrenia or schizoaffective disorder.
Results Principal components analysis demonstrated two major factors : one, accounting for about 50% of the variance, groups thought withdrawal, insertion and broadcasting, with delusions of control ; and the second, accounting for <20% of the variance, groups together third-person voices, thought echo and running commentary. Factor I was significantly correlated within sibling pairs.
Conclusions The correlation within sibling pairs suggests that, contrary to the conclusion of some previous studies, some nuclear symptoms do show a degree of familiality and therefore perhaps heritability.
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