Objective: This study aimed to clarify the influence of age on rehabilitation outcome by using corrected motor FIM (FIM-M) effectiveness, an outcome indicator in which the influence of FIM-M at admission was corrected. Methods: The subjects were 1,101 stroke patients. The value of A in the equation, Corrected FIM-M effectiveness = FIM-M gain / (A-FIM-M at admission) was set as 42, 64, 79, 83, 87, 89, and 91 points (for FIM-M score at admission of 13-18, 19-24, 25-30, 31-36, 37-42, 43-48, and 49-90 points, respectively). The subjects were divided into 10 groups by age with a 5-year range in which the average of corrected FIM-M effectiveness was calculated. Results:The mean corrected FIM-M effectiveness was almost constant in five groups below 69 years and decreased almost linearly as age increased in five groups over 70 years. Conclusion:The outcome decreases almost linearly after the age of 70 years old.

model 2). The coefficient of determination adjusted for the degrees of freedom R* 2 and the residuals obtained by subtracting the predicted value from the measured value of motor FIM gain were investigated. Results:The R* 2 of model 1 was 0.364 and that of model 2 was 0.711. The residual of model 1 was 0 ± 12.3 and that of model 2 was 0 ± 8.3. In model 2, the standard deviation of the residual was reduced. Conclusion:Adding FIM improvement for one month to the explanatory variables increased the prediction accuracy of FIM gain.

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