Journal article
Parcellating cognitive heterogeneity in early psychosis-spectrum illnesses: A cluster analysis
Schizophrenia Research, Vol.202, pp.91-98
2018
PMID: 30042029
Appears in Thompson Institute Research Collection
Abstract
Cognitive impairment is argued to represent a core feature of psychosis-spectrum illnesses. However, within-diagnosis heterogeneity is common, and risk factors for poor cognition remain to be examined after statistically accounting for heterogeneity. Accordingly, we used a data-driven technique (cluster analysis) to empirically-derive cognitive clusters across diagnoses and examined whether concurrent substance use or a history of a neurodevelopmental/behavioral disorder differed between clusters. Data from 135 young help-seekers (aged 12-30 years) with a psychosis-spectrum illness were retrospectively analyzed. Ward's hierarchical cluster analysis classified three cognitive clusters characterized by: (1) normal-range; (2) mixed; and (3) grossly-impaired performance. Despite mostly comparable clinical and demographic measures, cluster 1 had superior socio-occupational functioning and the highest estimated premorbid IQ, followed sequentially by clusters 2 and 3. Proportions of cannabis and amphetamine users did not differ significantly across clusters, nor did rates of patients with a neurodevelopmental/behavioral disorder history. Cluster 3 was however comprised of fewer 'risky' drinkers, possibly reflecting reduced opportunity for social drinking associated with cognitive impairment. Estimated premorbid IQ predicted cluster membership (2 vs. 1 & 3 vs. 1), as did clinician-rated socio-occupational functioning and 'not being enrolled in school or tertiary education' (3 vs. 1). Our results suggest that concurrent substance use and history of a neurodevelopmental/behavioral disorder do not adequately explain cluster-level cognitive variance in this sample. Future work should integrate neurobiological measures associated with cognition (e.g. white matter integrity) to discern whether clusters reflect neurobiological subtypes better representative of pathophysiology than present symptom-based classifications. © 2018 Elsevier B.V.
Details
- Title
- Parcellating cognitive heterogeneity in early psychosis-spectrum illnesses: A cluster analysis
- Authors
- Jacob J Crouse (Corresponding Author) - University of SydneyAhmed A Moustafa (Author) - Western Sydney UniversitySophia E R Bogaty (Author) - University of SydneyIan B Hickie (Author) - University of SydneyDaniel F Hermens (Author) - University of the Sunshine Coast - Thompson Institute
- Publication details
- Schizophrenia Research, Vol.202, pp.91-98
- Publisher
- Elsevier BV
- Date published
- 2018
- DOI
- 10.1016/j.schres.2018.06.060
- ISSN
- 0920-9964; 1573-2509
- PMID
- 30042029
- Organisation Unit
- University of the Sunshine Coast, Queensland; Thompson Institute
- Language
- English
- Record Identifier
- 99450878302621
- Output Type
- Journal article
Metrics
399 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- International collaboration
- Web Of Science research areas
- Psychiatry
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: SDGs from InCites