The Subjective Experiences of Psychosis Scale (SEPS): psychometric evaluation of a scale to assess outcome in psychosis.
Gillian Haddock, Lisa Wood, Rachel Watts, Graham Dunn, Anthony P Morrison, Jason Price
Schizophrenia Research October 14, 2011 DOI: 10.1016/j.schres.2011.09.023 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Psychometric validation study Peer reviewed |
|---|---|
| Sample size | 100 |
| Population | People experiencing psychosis |
| Measures | Subjective Experiences of Psychosis Scale (SEPS), PANSS, PSYRATS |
| Keywords | Humans Sensitivity and specificity Reproducibility of results Psychotic disorders Psychometrics Principal component analysis Adolescent Middle aged Female Young adult Self report Surveys and questionnaires |
| Key points | The Subjective Experiences of Psychosis Scale showed two factors reflecting positive and negative aspects of psychotic experiences, with good test-retest reliability, internal consistency, and sensitivity to change. It correlated with the PANSS, PSYRATS, and self-report measures of affect, esteem, recovery, and functioning, which the authors take as evidence of validity. |
Abstract
Background: A range of outcome measures has been developed to assess psychotic symptoms. Many of these are observer based assessments which rate the presence and severity of broad symptom types. There is a need for service-user generated multi-dimensional scales to assess psychosis.
Aims: To investigate the psychometric properties of a service user generated, self-report scale to assess recovery in relation to psychotic symptoms.
Method: The reliability and validity of the Subjective Experiences of Psychosis Scale (SEPS) was investigated with 100 participants experiencing psychosis against observer rated assessments of psychosis and self report measures of affect, esteem, recovery and functioning.
Results: Two factors emerged representing positive and negative aspects of psychotic experiences. Test-retest reliability, internal consistency and sensitivity to change were good and the scales correlated with the PANSS, PSYRATS and measures of affect, esteem, recovery and functioning.
Conclusions: The SEPS is a reliable and valid tool which can be used to evaluate outcome from treatment and which reflects the multi-dimensional experience of psychosis.