Psychosis screening questionnaire: Exploring its factor structure among South African adults
South African Journal of Psychiatry
| Field | Value | |
| Title | Psychosis screening questionnaire: Exploring its factor structure among South African adults | |
| Creator | Thungana, Yanga A. Zingela, Zukiswa Van Wyk, Stefan J. Kim, Hannah H. Ametaj, Amantia Stevenson, Anne Stroud, Rocky E. Stein, Dan J. Gelaye, Bizu | |
| Description | Background: Early detection of psychosis improves treatment outcomes, but there is limited research evaluating the validity of psychosis screening instruments, particularly in low-resourced countries.Aim: This study aims to assess the construct validity and psychometric properties of the psychosis screening questionnaire (PSQ) in South Africa.Setting: This study was conducted at several health centres in the Western and Eastern Cape provinces in South Africa.Methods: The sample consisted of 2591 South African adults participating as controls in a multi-country case-control study of psychiatric genetics. Using confirmatory factor analysis and item response theory, we evaluated the psychometric properties of the PSQ.Results: Approximately 11% of the participants endorsed at least one psychotic experience on the PSQ, and almost half of them (49%) occurred within the last 12 months. A unidimensional model demonstrated good fit (root mean square error of approximation [RMSEA] = 0.023, comparative fit index [CFI] = 0.977 and Tucker–Lewis Index [TLI] = 0.954). The mania item had the weakest association with a single latent factor (standardised factor loading = 0.14). Model fit improved after removing the mania item (RMSEA = 0.025, CFI = 0.991 and TLI = 0.972). With item response theory analysis, the PSQ provided more information at higher latent trait levels.Conclusion: Consistent with prior literature, the PSQ demonstrated a unidimensional factor structure among South Africans. In our study, the PSQ in screening for psychosis performed better without the mania item, but future criterion validity studies are warranted.Contribution: This study highlights that PSQ can be used to screen for early psychosis. | |
| Publisher | AOSIS | |
| Date | 2023-11-17 | |
| Identifier | 10.4102/sajpsychiatry.v29i0.2051 | |
| Source | South African Journal of Psychiatry; Vol 29 (2023); 7 pages 2078-6786 1608-9685 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://sajp.org.za/index.php/sajp/article/view/2051/3145
https://sajp.org.za/index.php/sajp/article/view/2051/3146
https://sajp.org.za/index.php/sajp/article/view/2051/3147
https://sajp.org.za/index.php/sajp/article/view/2051/3148
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