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Combining cognitive testing and informant report to increase accuracy in screening for dementia
1Mental Health Research Institute of Victoria, Melbourne, Australia. ajm@cortex.mhri.edu.au
The American Journal of Psychiatry
|November 13, 1998
Summary
Combining cognitive tests with informant reports significantly improves dementia screening accuracy. This approach enhances the detection of dementia cases and non-cases in clinical settings.
Area of Science:
- Geriatric Medicine
- Neurology
- Psychiatry
Background:
- Early and accurate dementia diagnosis is crucial for timely intervention and management.
- Current screening methods, including cognitive tests, may have limitations in sensitivity and specificity.
Purpose of the Study:
- To evaluate the combined use of cognitive testing and informant reports for improved dementia screening accuracy.
- To develop and assess methods for combining test scores suitable for clinical application.
Main Methods:
- 106 patients from a Swiss university hospital system were assessed.
- Instruments included the Mini-Mental State Examination and the Informant Questionnaire on Cognitive Decline in the Elderly.
- Dementia diagnosis followed DSM-IV criteria.
Main Results:
- Logistic regression showed combined tests predicted dementia more accurately than individual tests.
- Receiver operating characteristic analysis evaluated 'or', 'and', and weighted sum combinations.
- Both 'or' rule and weighted sum significantly improved screening performance.
Conclusions:
- Informant reports can be formally integrated to enhance dementia detection accuracy.
- A graphical method was developed for robust individual case assessment without complex calculations.