Reliability and validity testing of a single-item physical activity measure
Reliability and validity testing of a single-item physical activity measure
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DOI：
10.1136/bjsm.2009.068395
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发表时间：
2011-03-01
影响因子：
18.4
通讯作者：
Bauman, A.
中科院分区：
文献类型：
--
作者：
Milton, K.;Bull, F. C.;Bauman, A.
目的开发和测试一种新的单项体力活动筛查工具，适用于评估受访者的资格行为改变interventions.Design两个单项评估工具的开发，一个使用“过去一周”的回忆期，其他使用“过去一个月”的回忆期。采用配额抽样制度，从英格兰、苏格兰和威尔士招募了480名成年人。一半的样本完成了上周的问题，一半完成了上个月的版本。在2- 5天的时间内评估重测信度。并行效度进行了评估，使用全球体力活动问卷和英国积极的人调查。结果两种版本的单项量表均具有较强的重复性（r=0.72-0.82），采用斯皮尔曼等级相关系数（rank correlation coefficients，RRC）进行检验。过去一周的回忆问题显示，符合当前体力活动建议的受访者分类非常一致（kappa=0.63，95% CI 0.54至0.72）。并行效度在过去的一周相比，全球体力活动问卷是温和的（r=0.53），略弱，在过去的一个月相比，积极的人Survey（r=0.33-0.48）。结论两个版本的新的单项测量以及其他短体力活动工具的可靠性和并行效度。建议对单项指标进行标准有效性检验，以确定其评估客观测量的身体活动水平的能力。此外，进一步开展研究，评估单项措施在检测身体活动变化方面的反应性，将有助于了解其在方案评价中的作用。
Objective To develop and test a new single-item physical activity screening tool, suitable for assessing respondents' eligibility for behaviour change interventions.Design Two single-item assessment tools were developed, one using a "past week" recall period, the other using a "past month" recall period. A quota sampling system was used to recruit 480 adults from across England, Scotland and Wales. Half the sample completed the past-week question and half completed the past-month version. Test-retest reliability was assessed over a 2- to 5-day period. Concurrent validity was assessed using the Global Physical Activity Questionnaire and the UK Active People Survey. All surveys were completed via telephone interviews.Results Both versions of the single-item instrument demonstrated strong reproducibility (r=0.72-0.82), using Spearman's rank correlation coefficients. The past-week recall question showed strong agreement in the classification of respondents meeting the current physical activity recommendation (kappa=0.63, 95% CI 0.54 to 0.72). Concurrent validity over the past week compared to the Global Physical Activity Questionnaire was modest (r=0.53) and slightly weaker for the past month compared to the Active People Survey (r=0.33-0.48).Conclusion Both versions of the new single-item measure performed as well as other short physical activity tools in terms of reliability and concurrent validity. Criterion validity testing of the single-item measure is recommended to establish its ability to assess objectively measured physical activity levels. In addition, further research to assess the responsiveness of the single-item measure in detecting changes in physical activity will inform its usefulness in programme evaluation.