Montreal Cognitive Assessment - Single Cutoff Achieves Screening Purpose

Area of Science:

• Gerontology
• Neuropsychology
• Cognitive Assessment

Background:

• Cognitive impairment is a growing concern in aging populations.
• Accurate screening tools are crucial for early detection and intervention.
• The Montreal Cognitive Assessment, Hong Kong version (HK-MoCA) is a widely used cognitive screening tool.

Purpose of the Study:

• To compare the performance of norm-derived age and education adjusted cutoff scores versus single cutoff scores for the HK-MoCA.
• To evaluate the effectiveness of different HK-MoCA scoring methods in classifying cognitive impairment in Chinese older adults.

Main Methods:

• A total of 315 subjects (128 with dementia, 122 with mild cognitive impairment (MCI), and 65 normal) were assessed.
• HK-MoCA total scores were analyzed using norm-derived cutoffs (16th, 7th, 2nd percentiles) and single cutoff scores.
• Performance was compared based on sensitivity, specificity, and accuracy in classifying cognitive status.

Main Results:

• Single cutoff scores demonstrated good sensitivity and specificity in differentiating normal cognition, MCI, and dementia.
• Norm-derived adjusted cutoff scores offered high specificity but at the cost of sensitivity.
• Classification accuracy was 85.3% with single cutoff scores, while consistency with expert diagnoses varied for norm-derived cutoffs.

Conclusions:

• The HK-MoCA is a valuable and time-efficient screening tool for cognitive impairment.
• Single cutoff scores, with simple education adjustment, effectively serve the screening purpose for MCI and dementia in Chinese older adults.
• The study highlights the practical utility of the HK-MoCA in clinical settings for cognitive assessment.