Data Sheet 1_Average performance and performance variability on a brief functional fine motor test reflect distinct behavioral constructs in aging.docx

Generalized linear models included age, sex, education, and both scoring methods on the functional fine motor test (mean trial time and trial time variability) as predictors. Longer mean trial time was associated with slower grooved pegboard performance and lower grip strength, whereas trial time variability was not associated with either standard motor assessment. These findings, along with patterns of partial correlations, suggest that mean trial time may predominantly reflect motor function while trial time variability does not.

Together, these findings highlight the value of considering both mean performance and performance variability in tasks that include multiple trials, offering an efficient approach to assessing multiple domains in older adults.</p>