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Methods for assessing positive and negative symptoms.
1Department of Psychiatry, University of Iowa College of Medicine, Iowa City.
Modern Problems of Pharmacopsychiatry
|January 1, 1990
Summary
The Scale for the Assessment of Negative Symptoms (SANS) shows high internal consistency, unlike the Scale for the Assessment of Positive Symptoms (SAPS). Documenting all symptoms is crucial for clinical and research settings, especially in pharmacologic studies.
Area of Science:
- Psychiatry
- Clinical Psychology
- Psychometrics
Background:
- Internal consistency and external validity are crucial for psychometric instruments.
- The Scale for the Assessment of Negative Symptoms (SANS) and the Scale for the Assessment of Positive Symptoms (SAPS) are used to describe psychiatric symptoms.
Purpose of the Study:
- To evaluate the internal consistency of the SANS and SAPS.
- To discuss the clinical and research implications of the internal consistency findings for SANS and SAPS.
Main Methods:
- The study analyzed the internal consistency of SANS and SAPS using factor analysis.
- Data were collected from consecutive admissions of DSM-III schizophrenic patients.
Main Results:
- The SANS demonstrated high internal consistency.
- The SAPS exhibited lower internal consistency compared to the SANS.
- Factor analysis results indicated a less distinct separation between positive and negative symptoms in the second study compared to the first.
Conclusions:
- High internal consistency of SANS suggests symptoms are highly interrelated.
- Lower internal consistency of SAPS implies positive symptoms may not co-occur as frequently.
- Despite statistical correlations, comprehensive symptom documentation is vital for individual patient assessment and treatment response in clinical and research settings.