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Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)

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A reduced scoring system for the Clock Drawing Test using a population-based sample.

Alexandra Jouk¹, Holly Tuokko

¹Department of Psychology and Centre on Aging, University of Victoria, Victoria, British Columbia, Canada. ajouk@uvic.ca.

International Psychogeriatrics

|June 2, 2012

Summary

This summary is machine-generated.

A new simplified scoring system for the Clock Drawing Test (CDT) was developed using a Canadian population sample. This validated dementia screening tool, the Jouk scoring method, offers a reliable and simple approach for clinicians and researchers.

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Area of Science:

Neurology
Gerontology
Psychometrics

Background:

Existing Clock Drawing Test (CDT) scoring systems are derived from clinical samples.
There is a need for a dementia screening tool validated in population-based samples.

Purpose of the Study:

To evaluate and combine errors from existing scoring systems (Lessig and Tuokko) for the CDT.
To create a simple, optimal, population-based scoring procedure for dementia screening in Canada.

Main Methods:

Analysis of clock drawings from 356 participants (80 with dementia, 276 healthy controls) from the Canadian Study on Health and Aging.
Logistic regression and Receiver Operating Characteristic curves were used to develop the new Jouk scoring method.
Comparison of the Jouk method with established scoring systems (Shulman, Tuokko, Watson, Wolf-Klein).

Main Results:

The Jouk scoring system identified five critical errors: missing numbers, repeated numbers, number orientation, extra marks, and number distance.
Achieved a sensitivity of 81% and specificity of 68% with a cut-off score of one error.
Demonstrated balanced sensitivity/specificity compared to traditional methods in a population-based sample.

Conclusions:

The Jouk scoring system validates a simplified approach for CDT in a representative population.
This method mimics real-world clinical and research conditions outside specialized dementia clinics.
The Jouk CDT scoring system offers a simple, reliable dementia-screening tool for broad use.