Weiss Carlos O, Seplaki Christopher L, Wolff Jennifer L, Kasper Judith D, Agree Emily M
Division of Geriatric Medicine & Gerontology, Johns Hopkins School of Medicine, Baltimore, MD 21224-2734, USA.
J Clin Epidemiol. 2008 Jun;61(6):622-7. doi: 10.1016/j.jclinepi.2007.07.020. Epub 2008 Mar 10.
To assess whether loss of consistency or systematic measurement error is introduced by allowing older individuals to use a cane during measurement of self-selected walking speed (SSWS).
Observational study of women aged 65+ (Women's Health and Aging Study I, n=1,002).
Of individuals who use a cane in daily life, 201 (50.76%) did not use an aid during testing. The Coefficient of Variation was low in individuals who reported cane use in daily life but did not use one in testing (10.72%), and did not vary substantially if a cane was used (12.04%). The Intra-Class Correlation Coefficient was high: 0.958 for those who reported cane use in daily life but did not use one during testing and 0.962 for those who used a cane. In both groups, Bland-Altman plots revealed a small systematic difference between the first and second trials. There was no evidence of effect modification of the association between SSWS and mobility disability by cane use during testing.
This observational study found neither evidence of poorer consistency nor increased measurement bias in SSWS recorded while using a cane compared to using no assistive device.
评估在测量自选步行速度（SSWS）时允许老年人使用手杖是否会引入一致性丧失或系统测量误差。
对65岁及以上女性进行的观察性研究（女性健康与衰老研究I，n = 1,002）。
在日常生活中使用手杖的个体中，201人（50.76%）在测试期间未使用辅助器具。在日常生活中报告使用手杖但在测试中未使用的个体中，变异系数较低（10.72%），如果使用手杖，变异系数也没有显著变化（12.04%）。组内相关系数较高：在日常生活中报告使用手杖但在测试期间未使用的个体为0.958，使用手杖的个体为0.962。在两组中，Bland-Altman图显示第一次和第二次试验之间存在较小的系统差异。没有证据表明在测试期间使用手杖会改变SSWS与行动障碍之间关联的效应。
这项观察性研究发现，与不使用辅助设备相比，使用手杖记录的SSWS既没有一致性较差的证据，也没有测量偏差增加的证据。
