Testing took place at the participating facilities. Patients performed one practice run of the TUG and one practice pass on the GAITRite walk way. They did not perform a practice run of the 6MWT, but were oriented to the walking course. Each testing session included 2 trials of the TUG, 2 passes at a comfortable pace on the GAITRite mat, and 1 trial of the 6MWT. Tests were performed in variable order to control for variability of performance from first to last test as a confounding factor. The order of test administration was randomized, determined by blind drawing of test order from all possible combinations for each participant. The test order administration remained constant from test session 1 to test session 2 for each participant.