Using a single question to assess physical activity in older adults: a reliability and validity study
Using a single question to assess physical activity in older adults: a reliability and validity study
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DOI：
10.1186/1471-2288-12-20
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发表时间：
2012-02-28
影响因子：
4
通讯作者：
Speechley, Mark
中科院分区：
文献类型：
--
作者：
Gill, Dawn P.;Jones, Gareth R.;Speechley, Mark
背景：单项身体活动问题提供了身体活动水平的快速近似值。虽然回忆问卷提供了一个人的身体活动水平的更详细的图片，单项问题可能更适合在某些情况下。本研究的目的是评估两个单项目的体力活动问题（一个绝对问题和一个相对问题）的重测信度，收敛效度，判别效度，在一个样本中的老年人。方法：数据来自项目，以防止福尔斯在退伍军人，跌倒危险因素筛选和修改试验。一个问题测量绝对的身体活动（很少，适度，剧烈活动），一个测量相对的身体活动（比同龄人更多，大约，更少）。重测信度采用加权Kappa统计（Kappa）在43名受试者的样本进行了检查。在接受临床评估的参与者（n = 159）中使用相关系数（r）评估有效性。结果：绝对体力活动问题比相对体力活动问题更可靠（kappa = 0.75 vs. kappa = 0.56）。然而，相对体力活动问题的收敛效度更强（r = 0.28至0.57 vs. r = 0.10至0.33）。两个问题的判别效度相似。对于相对体力活动问题，当这个问题在7天后重新管理时，有中度一致性，与身体功能指标相比，有公平到中度/良好的关联，与假设理论上与体力活动无关的措施相比，几乎没有关联。结论：相对体力活动问题的重测信度、收敛效度和区分效度的组合最好。在需要测量身体活动的研究中，如果身体活动不是主要关注点，并且更详细的测量不可行，则单个问题可能是可接受的替代方案。
Background: Single-item physical activity questions provide a quick approximation of physical activity levels. While recall questionnaires provide a more detailed picture of an individual's level of physical activity, single-item questions may be more appropriate in certain situations. The aim of this study was to evaluate two single-item physical activity questions (one absolute question and one relative question) for test-retest reliability, convergent validity, and discriminant validity, in a sample of older adults.Methods: Data was obtained from the Project to Prevent Falls in Veterans, a fall risk-factor screening and modification trial. One question measured absolute physical activity (seldom, moderately, vigorously active) and one measured relative physical activity (more, about as, less active than peers). Test-retest reliability was examined using weighted Kappa statistics (kappa) in a sample of 43 subjects. Validity was assessed using correlation coefficients (r) in participants who received clinical assessments (n = 159).Results: The absolute physical activity question was more reliable than the relative physical activity question (kappa = 0.75 vs. kappa = 0.56). Convergent validity, however, was stronger for the relative physical activity question (r = 0.28 to 0.57 vs. r = 0.10 to 0.33). Discriminant validity was similar for both questions. For the relative physical activity question, there was moderate agreement when this question was re-administered seven days later, fair to moderate/good associations when compared with indicators of physical function, and little to no associations when compared with measures hypothesized to be theoretically not related to physical activity.Conclusions: The relative physical activity question had the best combination of test-retest reliability, convergent validity and discriminant validity. In studies requiring a measure of physical activity, where physical activity is not the primary focus and more detailed measures are not feasible, a single question may be an acceptable alternative.