A 4-Item Case-Finding Tool to Detect Dementia in Older Persons

Area of Science:

• Neuroscience
• Gerontology
• Cognitive Psychology

Background:

• Brief cognitive tests are crucial for early dementia detection in non-specialty clinics.
• The Montreal Cognitive Assessment (MoCA) is widely used but too lengthy for routine nonspecialist use.
• A diagnostic gap exists for dementia due to limited screening in primary care.

Purpose of the Study:

• To develop and validate a brief cognitive test as a case-finding tool for dementia.
• To assess if a subset of the MoCA can effectively identify dementia in older adults.
• To create a screening tool suitable for nonspecialty clinical settings.

Main Methods:

• Cross-sectional test research involving 8773 participants aged 65 and older.
• A derivation sample (n=4386) was used to develop a short MoCA variant using best-subset selection and cross-validation.
• A validation sample (n=4387) confirmed the variant's performance using receiver operating characteristic-curve analysis (AUC).

Main Results:

• A 4-item cognitive test (Clock-drawing, Tap-at-letter-A, Orientation, Delayed-recall) was identified.
• The 4-item test showed excellent dementia detection performance (AUC 94.2%), comparable to the full MoCA (AUC 93.8%).
• The test achieved 87.9% sensitivity and 87.6% specificity for dementia detection at a cut-off score of <10.

Conclusions:

• A brief, free, and easily administered cognitive test (<5 minutes) has been developed.
• This test is suitable for dementia case-finding in primary care and geriatric clinics.
• The new tool can enhance integration between primary care and specialized memory clinics.