What Cut-Point in Gait Speed Best Discriminates Community-Dwelling Older Adults With Mobility Complaints From Those Without? A Pooled Analysis From the Sarcopenia Definitions and Outcomes Consortium
Author
Cawthon, Peggy MPatel, Sheena M
Kritchevsky, Stephen B
Newman, Anne B
Santanasto, Adam
Kiel, Douglas P
Travison, Thomas G
Lane, Nancy
Cummings, Steven R
Orwoll, Eric S
Duchowny, Kate A
Kwok, Timothy
Hirani, Vasant
Schousboe, John
Karlsson, Magnus K
Mellström, Dan
Ohlsson, Claes
Ljunggren, Östen
Xue, Qian-Li
Shardell, Michelle
Jordan, Joanne M
Pencina, Karol M
Fielding, Roger A
Magaziner, Jay
Correa-de-Araujo, Rosaly
Bhasin, Shalender
Manini, Todd M
Date
2021-06-24Journal
Journals of Gerontology. Series A, Biological Sciences and Medical SciencesPublisher
Oxford University PressType
Article
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Background Cut-points to define slow walking speed have largely been derived from expert opinion. Methods Study participants (13 589 men and 5043 women aged ≥65years) had walking speed (m/s) measured over 4-6 m (mean ± SD: 1.20 ± 0.27 m/s in men and 0.94 ± 0.24 m/s in women.) Mobility limitation was defined as any self-reported difficulty with walking approximately 1/4 mile (prevalence: 12.6% men, 26.4% women). Sex-stratified classification and regression tree (CART) models with 10-fold cross-validation identified walking speed cut-points that optimally discriminated those who reported mobility limitation from those who did not. Results Among 5043 women, CART analysis identified 2 cut-points, classifying 4144 (82.2%) with walking speed ≥0.75 m/s, which we labeled as "fast"; 478 (9.5%) as "intermediate" (walking speed ≥0.62 m/s but <0.75 m/s); and 421 (8.3%) as "slow" (walking speed <0.62 m/s). Among 13 589 men, CART analysis identified 3 cut-points, classifying 10 001 (73.6%) with walking speed ≥1.00 m/s ("very fast"); 2901 (21.3%) as "fast" (walking speed ≥0.74 m/s but <1.00 m/s); 497 (3.7%) as "intermediate" (walking speed ≥0.57 m/s but <0.74 m/s); and 190 (1.4%) as "slow" (walking speed <0.57 m/s). Prevalence of self-reported mobility limitation was lowest in the "fast" or "very fast" (11% for men and 19% for women) and highest in the "slow" (60.5% in men and 71.0% in women). Rounding the 2 slower cut-points to 0.60 m/s and 0.75 m/s reclassified very few participants. Conclusions Cut-points in walking speed of approximately 0.60 m/s and 0.75 m/s discriminate those with self-reported mobility limitation from those without.Rights/Terms
© The Author(s) 2021. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.Identifier to cite or link to this item
http://hdl.handle.net/10713/16952ae974a485f413a2113503eed53cd6c53
10.1093/gerona/glab183
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