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Dementia

Dementia

Dementia is a collective term for cognitive disorders primarily affecting memory, thinking, and reasoning. It is not a specific disease but a syndrome, with Alzheimer's disease being the most common cause, accounting for approximately 60-80% of cases. Other types include vascular dementia, Lewy body dementia, and frontotemporal dementia. Dementia affects millions worldwide, particularly older adults, though it is not a normal part of aging.
The progression of dementia is generally gradual....

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Related Experiment Video

Updated: Oct 12, 2025

A Machine Learning Approach to Design an Efficient Selective Screening of Mild Cognitive Impairment

A Machine Learning Approach to Design an Efficient Selective Screening of Mild Cognitive Impairment

Published on: January 11, 2020

Communicating Risk: Developing an "Efficiency Index" for Dementia Screening Tests.

Andrew J Larner¹

¹Cognitive Function Clinic, Walton Centre for Neurology and Neurosurgery, Lower Lane, Fazakerley, Liverpool L9 7LJ, UK.

|November 27, 2021

Summary

A new "efficiency index" (EI) metric simplifies risk communication for dementia screening tests. This tool helps clinicians and patients understand the trade-off between accurate diagnosis and potential misdiagnosis.

Keywords:

dementia diagnosis efficiency index risk communication screening test

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Last Updated: Oct 12, 2025

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Area of Science:

Medical Diagnostics
Cognitive Screening
Health Communication

Background:

Diagnostic and screening tests present risks like misdiagnosis and benefits of correct diagnosis.
Communicating these risks effectively to clinicians and patients is challenging.

Purpose of the Study:

To develop a novel metric, the "efficiency index" (EI), for evaluating dementia screening tests.
To compare EI with the existing "likelihood to be diagnosed or misdiagnosed" (LDM) metric.

Main Methods:

Analyzed data from four cognitive screening instruments (Mini-Mental State Examination, Montreal Cognitive Assessment, Mini-Addenbrooke's Cognitive Examination (MACE), Free-Cog).
Calculated EI and LDM values, examining variations with test cut-off and dementia prevalence.
Utilized a modification of McGee's heuristic to estimate diagnostic probability changes using EI.

Main Results:

The efficiency index (EI) is simpler to compute than LDM.
EI can be classified qualitatively or quantitatively, similar to likelihood ratios.
EI effectively illustrates the utility/inutility of screening tests and the diagnosis/misdiagnosis trade-off.

Conclusions:

The efficiency index (EI) offers a more accessible method for evaluating diagnostic test performance.
EI facilitates clearer communication of risks associated with screening tests for both healthcare providers and patients.
EI may improve understanding of the balance between diagnostic accuracy and potential misdiagnosis in dementia screening.