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  • Title: Two-minute walk test performance by adults 18 to 85 years: normative values, reliability, and responsiveness.
    Author: Bohannon RW, Wang YC, Gershon RC.
    Journal: Arch Phys Med Rehabil; 2015 Mar; 96(3):472-7. PubMed ID: 25450135.
    Abstract:
    OBJECTIVES: To provide (1) normative reference values for the 2-minute walk test (2MWT), (2) reference equations for the 2MWT, and (3) information on the reliability and responsiveness of the 2MWT across the adult lifespan. DESIGN: Cross-sectional study. SETTING: General community settings. PARTICIPANTS: A population-based sample of adult participants (N=1137) contributed data to this study, which was part of the National Institutes of Health (NIH) Toolbox for the Assessment of Neurological and Behavioral Function Norming Project. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: 2MWT. RESULTS: Overall, the distance participants walked ranged from 64.6 to 300.8m (mean, 180.9m). Men walked farther than did women (189.4m vs 176.0m; t=6.8; df=1,135; P<.001). Significant correlations were observed between the 2MWT and age (r=-.41), height (r=.29), weight (r=-.16), and body mass index (r=-.32). Age and body mass index were used in the linear regression modeling to predict the 2MWT distance (R(2)=.55-.56). Test-retest reliability of the 2MWT as characterized by the intraclass correlation coefficient was .82 (95% confidence interval, .76-.87). Based on a standard error of measurement of 15.3m, the minimum detectable change for the 2MWT was 42.5m. CONCLUSIONS: The study presents norms of the 2MWT established by the NIH Toolbox. The norms can be used to determine the presence of limitations in walking endurance across the lifespan.
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