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Cognitive Function Z-Score

Meaning

The Cognitive Function Z-Score is a standardized statistical measure used in clinical neuropsychology to quantify an individual’s performance on a specific cognitive test relative to a reference population, typically adjusted for age and education. A Z-score indicates the number of standard deviations an individual’s raw score deviates from the mean score of their peer group. This metric provides a precise, quantitative assessment of cognitive status, allowing clinicians to objectively track changes in domains such as memory, executive function, and processing speed over time. The score is a powerful tool for early detection of subtle cognitive decline.