Assessing Longitudinal Cognitive Change in Mild Cognitive Impairment Using Estimated Standardized Regression-Based...

Area of Science:

• Neuroscience
• Gerontology
• Psychology

Background:

• Mild cognitive impairment (MCI) is a precursor to Alzheimer's disease.
• Quantifying cognitive change in MCI patients over time is crucial but underexplored.
• Standardized regression-based (SRB) formulas offer a method to statistically assess cognitive changes using z-scores.

Purpose of the Study:

• To quantify cognitive change in MCI patients using SRB z-scores.
• To compare cognitive decline between patients who remained MCI and those who progressed to dementia.

Main Methods:

• Utilized data from 283 MCI patients assessed at baseline and after approximately 1.5 years.
• Calculated SRB z-scores for each participant across a comprehensive neuropsychological battery.
• Compared cognitive changes between MCI-Stable and MCI-Decline groups.

Main Results:

• All cognitive tests showed significant decline over time, particularly in learning and memory.
• The MCI-Decline group exhibited significantly greater cognitive decline than the MCI-Stable group.
• Even MCI-Stable participants displayed notable cognitive decline, with z-scores indicating significant deviation from normative data.

Conclusions:

• MCI involves substantial cognitive decline, affecting both stable patients and those progressing to dementia.
• SRB z-scores provide a valuable tool for precise quantification of cognitive decline in MCI.
• This quantification may assist in identifying individuals most susceptible to MCI progression.