ABBREVIATION
TUGTimed Up and Go RESULTS In phase 1, the mean time to perform the TUG test was 5.61 seconds (SD 1.06).
AIMValues were stratified in age groups that served as normative data for both sexes. A multiple linear regression analysis was conducted and the best variables to predict TUG scores were age and weight. The best model obtained presented an R 2 of 0.25 and a standard error of the estimate of 0.92. Excellent intrasession reliability in the three tests performed (intraclass correlation coefficient [ICC] of 0.93, 0.94, and 0.95) and between the sessions (both with an ICC of 0.95) was demonstrated. In phase 2, the test also showed excellent reproducibility (ICC=0.82 between the two tests performed). The performance time was significantly longer (p<0.001) in individuals with Down syndrome compared with sex-age-, and weight-matched typically developing children with a mean difference of À3.53 (95% confidence interval À4.05 to À3.00). Dimension E of the GMFM (Walking, Running and Jumping) showed the highest correlation (r=À0.55, p<0.001) with the test.