Validity of the 8-Foot Up and Go, Timed Up and Go, and Activities-Specific Balance Confidence Scale in older adults with and without cognitive impairment.

The purpose of this study was to determine whether (1) mild cognitive impairment (MCI) alters the validity of the Timed Up and Go (TUG), the 8-Foot Up and Go (8UG), or the Activities-Specific Balance Confidence (ABC) scale in the identification of fallers and nonfallers and (2) there were differences in the concurrent validity between the TUG and ABC when compared with the 8UG and ABC in those with and without MCI.. The classification of MCI was based on a score of <26 points on the Montreal Cognitive Assessment. For the 62 participants enrolled, excellent correlations were demonstrated in pairwise comparisons between the outcome measures (on a continuous scale). Based on frequently cited cutpoints, the sensitivity of the TUG was only 20% with a specificity of 94.6% and the sensitivity of the 8UG was 64% with a specificity of 75.7%. The TUG identified fallers at significantly different rates than the 8UG and the ABC (p < 0.05). For this reason, the 8UG is recommended as a more appropriate outcome measure for identifying fall risk in community-dwelling older adults. Fall history was found as the only significant predictor of test outcome for the TUG, 8UG, and ABC, indicating that MCI is not a significant determinant of test performance.