ArticlePsychiatry research2018
The component structure of the scales for the assessment of positive and negative symptoms in first-episode psychosis and its dependence on variations in analytic methods.
Article in Psychiatry research, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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12 citing papers in PubMed.
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- Efficacy and feasibility of aerobic exercise interventions as an adjunctive treatment for patients with schizophrenia: a meta-Analysis.Schizophrenia (Heidelberg, Germany) · 2024Article
- Negative Symptoms and Their Associations With Other Clinical Variables and Working Memory Across the Schizophrenia Spectrum and Bipolar Disorder.Schizophrenia bulletin open · 2024Article
- Using dimensionality-reduction techniques to understand the organization of psychotic symptoms in persistent psychotic illness and first episode psychosis.Scientific reports · 2023Article
- Peripheral Complement Factor-Based Biomarkers for Patients with First-Episode Schizophrenia.Neuropsychiatric disease and treatment · 2023Article
- Development of a women's empowerment index for Tanzania from the demographic and health surveys of 2004-05, 2010, and 2015-16.Emerging themes in epidemiology · 2021Article
- The Schizotypal Personality Questionnaire for Children (SPQ-C): Factor Structure, Child Abuse, and Family History of Schizotypy.Schizophrenia bulletin · 2021Article
- Multi-dimensional predictions of psychotic symptoms via machine learning.Human brain mapping · 2020Article
- Validation of the Chinese Version of the 16-Item Negative Symptom Assessment.Neuropsychiatric disease and treatment · 2020Article
- Functional brain alterations in auditory hallucination subtypes in individuals with auditory hallucinations without the diagnosis of specific neurological diseases and mental disorders at the current stage.Brain and behavior · 2020Article
- Brain function differences in drug-naïve first-episode auditory verbal hallucination-schizophrenia patients with versus without insight.Chinese medical journal · 2019Article
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7 authors.
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Abstract
A secondary analysis was undertaken on Scales for the Assessment of Positive and Negative Symptoms (SAPS/SANS) data from 345 first-episode psychosis (FEP) patients gathered in the West London FEP study. The purpose of this study was to determine: (i) the component structure of these measures in FEP (primary analyses), and (ii) the dependence of any findings in these primary analyses on variations in analytic methods. Symptom ratings were exposed to data reduction methods and the effects of the following manipulations ascertained: (i) level of analysis (individual symptom vs. global symptom severity ratings), (ii) extraction method (principal component vs. exploratory factor analysis) and (iii) retention method (scree test vs. Kaiser criterion). Whilst global ratings level analysis rendered the classic triad of psychotic syndromes (positive, negative and disorganisation), symptom level analyses revealed a hierarchical structure, with 11 first-order components subsumed by three second-order components, which also mapped on to this syndrome triad. These results were robust across data reduction but not component retention methods, suggesting that discrepancies in the literature regarding the component structure of the SAPS/SANS partly reflect the level of analysis and component retention method used. Further, they support a hierarchical symptom model, the implications of which are discussed.
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