Associations of psychotic symptom dimensions with clinical and developmental variables in twin and general clinical samples.

Cardno, Alastair G, Allardyce, Judith ORCID: https://orcid.org/0000-0003-4094-552X, Bakker, Steven C, Toulopoulou, Timothea, Kravariti, Eugenia, Picchioni, Marco M, Kane, Fergus, Rijsdijk, Frühling V, Mahmood, Tariq, Nasser El Din, Soumaya, du Toit, Deline, Jones, Lisa A, Quattrone, Diego, Walters, James T R ORCID: https://orcid.org/0000-0002-6980-4053, Legge, Sophie E, Holmans, Peter A ORCID: https://orcid.org/0000-0003-0870-9412, Murray, Robin M and Vassos, Evangelos 2024. Associations of psychotic symptom dimensions with clinical and developmental variables in twin and general clinical samples. The British Journal of Psychiatry , pp. 1-8. 10.1192/bjp.2024.129

PDF - Published Version Available under License Creative Commons Attribution. Download (614kB)

Abstract

Positive, negative and disorganised psychotic symptom dimensions are associated with clinical and developmental variables, but differing definitions complicate interpretation. Additionally, some variables have had little investigation. To investigate associations of psychotic symptom dimensions with clinical and developmental variables, and familial aggregation of symptom dimensions, in multiple samples employing the same definitions. We investigated associations between lifetime symptom dimensions and clinical and developmental variables in two twin and two general psychosis samples. Dimension symptom scores and most other variables were from the Operational Criteria Checklist. We used logistic regression in generalised linear mixed models for combined sample analysis ( = 875 probands). We also investigated correlations of dimensions within monozygotic (MZ) twin pairs concordant for psychosis ( = 96 pairs). Higher symptom scores on all three dimensions were associated with poor premorbid social adjustment, never marrying/cohabiting and earlier age at onset, and with a chronic course, most strongly for the negative dimension. The positive dimension was also associated with Black and minority ethnicity and lifetime cannabis use; the negative dimension with male gender; and the disorganised dimension with gradual onset, lower premorbid IQ and substantial within twin-pair correlation. In secondary analysis, disorganised symptoms in MZ twin probands were associated with lower premorbid IQ in their co-twins. These results confirm associations that dimensions share in common and strengthen the evidence for distinct associations of co-occurring positive symptoms with ethnic minority status, negative symptoms with male gender and disorganised symptoms with substantial familial influences, which may overlap with influences on premorbid IQ.

Item Type:	Article
Status:	In Press
Schools:	Medicine
Publisher:	Cambridge University Press
ISSN:	0007-1250
Date of First Compliant Deposit:	12 November 2024
Date of Acceptance:	30 June 2024
Last Modified:	12 Nov 2024 13:00
URI:	https://orca.cardiff.ac.uk/id/eprint/173888

Actions (repository staff only)

Edit Item