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A comparison between the Present State Examination and the Composite International Diagnostic Interview
A E Farmer1, R Katz, P McGuffin
1Institute of Psychiatry, London.
Archives of General Psychiatry
|December 1, 1987
Summary
Interrater agreement for the Present State Examination (PSE) and Composite International Diagnostic Interview (CIDI) was low for individual items but statistically significant for broader diagnostic classifications. This suggests diagnostic interviews can achieve reliable syndrome and class agreement despite item-level variability.
Area of Science:
- Psychiatry
- Clinical Psychology
- Psychometric Evaluation
Background:
- The Present State Examination (PSE) and Composite International Diagnostic Interview (CIDI) are widely used psychiatric diagnostic instruments.
- Assessing interrater reliability is crucial for the validity and consistency of diagnostic assessments.
- Previous studies have shown variable agreement rates for different diagnostic tools and symptom assessments.
Purpose of the Study:
- To compare item-by-item interrater agreement between the PSE and the PSE items within the CIDI.
- To evaluate agreement for CATEGO syndrome, diagnostic class, and Index of Definition between the two interview formats.
- To determine if broader diagnostic classifications show better agreement than individual item assessments.
Main Methods:
- A study involving 30 subjects with diverse diagnoses, including psychotic and neurotic conditions.
- Administration of both the PSE and the CIDI (containing PSE items) to each subject.
- Statistical comparison of agreement levels for individual items, syndrome classification, diagnostic class, and Index of Definition.
Main Results:
- Interrater agreement for individual items between the PSE and CIDI was found to be disappointing.
- However, agreement for broader diagnostic categories, including syndrome classification and diagnostic class, attained statistical significance.
- Agreement for the Index of Definition also showed significant results when considering broader diagnostic aspects.
Conclusions:
- While individual item agreement between the PSE and CIDI is limited, the interviews demonstrate statistically significant reliability for higher-level diagnostic classifications.
- This suggests that despite variability in symptom reporting, clinicians can achieve consensus on overall syndrome and diagnostic class using these instruments.
- The findings have implications for the use of structured and semi-structured interviews in clinical practice and research, highlighting the importance of focusing on diagnostic categories for reliable assessment.