Funded by National Institute on Aging Contracts 263-MA-202876 and R01-AG18844, Roybal Center for the Enhancement of Late-Life Function Grant P50-A11669, and a National Institute on Disability and Rehabilitation Research Post-Doctoral Fellowship in Health Services Research (H133P99004) to Dr. Sayers.
Use of Self-Report to Predict Ability to Walk 400 Meters in Mobility-Limited Older Adults
Article first published online: 18 NOV 2004
Journal of the American Geriatrics Society
Volume 52, Issue 12, pages 2099–2103, December 2004
How to Cite
Sayers, S. P., Brach, J. S., Newman, A. B., Heeren, T. C., Guralnik, J. M. and Fielding, R. A. (2004), Use of Self-Report to Predict Ability to Walk 400 Meters in Mobility-Limited Older Adults. Journal of the American Geriatrics Society, 52: 2099–2103. doi: 10.1111/j.1532-5415.2004.52571.x
- Issue published online: 18 NOV 2004
- Article first published online: 18 NOV 2004
Objectives: To determine whether the ability to walk 400 m could be predicted from self-reported walking habits and abilities in older adults and to develop an accurate self-report measure appropriate for observational trials of mobility when functional measures are impractical to collect.
Setting: University-based human physiology laboratory.
Participants: One hundred fifty community-dwelling older men and women (mean age±standard error= 79.8±0.3).
Measurements: An 18-item questionnaire assessing walking habits and ability was administered to each participant, followed by a 400-m walk test. Ninety-eight (65%) volunteers were able to complete the 400-m walk; 52 (35%) were unable. Logistic regression was performed using response items from a questionnaire as predictors and 400-m walk as the outcome.
Results: Three questions (Do you think you could walk one-quarter of a mile now without sitting down to rest. Because of a health or physical problem, do you have difficulty walking 1 mile? Could you walk up and down every aisle of a grocery store without sitting down to rest or leaning on a cart?) were predictive of 400-m walking ability and were included in the model. If participants answered all three questions compatible with the inability to walk 400 m, there was a 91% probability that they were unable to walk 400 m, with a sensitivity of 46% and a specificity of 97%.
Conclusion: A three-item self-report developed in the study was able to accurately predict mobility disability. The utility of this instrument may be in evaluating self-reported mobility in large observational trials on mobility when functional mobility tasks are impractical to collect.