Longitudinal accuracy of web-based self-reported weights: results from the Hopkins POWER Trial.
Longitudinal accuracy of web-based self-reported weights: results from the Hopkins POWER Trial.
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DOI：
10.2196/jmir.3332
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发表时间：
2014-07-15
影响因子：
7.4
通讯作者：
Appel, Lawrence J
中科院分区：
文献类型：
--
作者：
Jerome, Gerald J;Dalcin, Arlene;Appel, Lawrence J
背景技术背景：网站和手机应用程序越来越多地用于跟踪体重在减肥干预措施，但这些自我报告的重量的纵向准确性是uncertainty.OBJECTIVE：我们的目标是比较的纵向准确性的自我报告的重量输入在线过程中的随机减肥试验，在诊所采取的测量。我们的目的是确定自我报告体重的准确性是否与体重减轻有关，并确定当使用自我报告体重与诊所体重相比时，达到5%体重减轻的错误分类程度。这项研究检查了霍普金斯基于实践的减肥机会（POWER）试验中干预参与者在线记录的自我报告体重的准确性，一项随机试验，在至少有一个心血管危险因素的肥胖成年患者中，与对照组相比，检查两种基于生活方式的减肥干预措施的有效性。一个治疗组提供电话辅导，另一组提供面对面的个人辅导和小组会议。所有干预参与者（n=277）都收到了一个数字秤，并被要求每周在一个研究网站上跟踪他们的体重。研究人员使用标准协议在诊所测量体重。差异（自我报告的体重-诊所体重）表明自我报告的体重是否低于（-）或高于（+）估计的诊所体重，使用时间上最接近诊所体重的自我报告体重，并且在从诊所访视当天至6个月（n=225）和24个月（n=191）诊所访视前7天的时间窗内。差异的绝对值（绝对差异）描述了总体准确性。结果：低估自我报告的体重从6个月（平均值-0.5 kg，SD 1.0 kg）到24个月（平均值-1.1 kg，SD 2.0 kg; P= 0.002）显著增加。平均绝对差异也从6个月（平均0.7 kg，SD 0.8 kg）增加到24个月（平均1.3，SD 1.8 kg; P
BACKGROUND: Websites and phone apps are increasingly used to track weights during weight loss interventions, yet the longitudinal accuracy of these self-reported weights is uncertain.OBJECTIVE: Our goal was to compare the longitudinal accuracy of self-reported weights entered online during the course of a randomized weight loss trial to measurements taken in the clinic. We aimed to determine if accuracy of self-reported weight is associated with weight loss and to determine the extent of misclassification in achieving 5% weight loss when using self-reported compared to clinic weights.METHODS: This study examined the accuracy of self-reported weights recorded online among intervention participants in the Hopkins Practice-Based Opportunities for Weight Reduction (POWER) trial, a randomized trial examining the effectiveness of two lifestyle-based weight loss interventions compared to a control group among obese adult patients with at least one cardiovascular risk factor. One treatment group was offered telephonic coaching and the other group was offered in-person individual coaching and group sessions. All intervention participants (n=277) received a digital scale and were asked to track their weight weekly on a study website. Research staff used a standard protocol to measure weight in the clinic. Differences (self-reported weight - clinic weight) indicate if self-report under (-) or over (+) estimated clinic weight using the self-reported weight that was closest in time to the clinic weight and was within a window ranging from the day of the clinic visit to 7 days before the 6-month (n=225) and 24-month (n=191) clinic visits. The absolute value of the differences (absolute difference) describes the overall accuracy.RESULTS: Underestimation of self-reported weights increased significantly from 6 months (mean -0.5 kg, SD 1.0 kg) to 24 months (mean -1.1 kg, SD 2.0 kg; P=.002). The average absolute difference also increased from 6 months (mean 0.7 kg, SD 0.8 kg) to 24 months (mean 1.3, SD 1.8 kg; P