在线体重管理干预对非应答者的随访研究邮件与电话随机对照试验%A Couper,Mick P %A Peytchev,Andy %A Strecher,Victor J %A Rothert,Kendra %A Anderson,Julia %+密歇根大学社会研究所，美国密歇根州安娜堡市1248号邮政信箱，+1 734 647 3577,mcouper@umich.edu %K无反应%K消耗%K互联网%K体重管理%K随机对照试验%D 2007 %7 13.6.2007 %9原文%J J Med Internet Res %G English %X流失或退出是许多在线健康干预措施面临的一个问题，可能威胁到在线随机对照试验的推断价值。目的:在一项在线体重管理干预的随机对照试验的背景下，85%的基线参与者在12个月的测量中失去了随访，目的是检查无反应对关键结果的影响，并探索减少随访调查中的损耗的方法。方法:选取700名未回应者进行为期12个月的在线随访调查，随机分配至邮件或电话无回应随访调查。我们检查了两组的反应率、随访费用、无反应的原因和模式效应。我们运行了几个逻辑回归模型，预测对12个月的在线调查有反应或无反应，以及预测对后续调查有反应或无反应。结果:我们分析了210名邮件回访者和170名电话回访者。电话和邮件随访调查的回复率分别为59%和55%。共有197名受访者(51.8%)给出了与技术问题或电子邮件作为沟通手段有关的原因，老年人更有可能给出不完成的技术原因; 144 (37.9%) gave reasons related to the intervention or the survey itself. Mail follow-up was substantially cheaper: We estimate that the telephone survey cost about US $34 per sampled case, compared to US $15 for the mail survey. The telephone responses were subject to possible social desirability effects, with the telephone respondents reporting significantly greater weight loss than the mail respondents. The respondents to the nonresponse follow-up did not differ significantly from the 12-month online respondents on key outcome variables. Conclusions: Mail is an effective way to reduce attrition to online surveys, while telephone follow-up might lead to overestimating the weight loss for both the treatment and control groups. Nonresponse bias does not appear to be a significant factor in the conclusions drawn from the randomized controlled trial. %M 17567564 %R 10.2196/jmir.9.2.e16 %U //www.mybigtv.com/2007/2/e16/ %U https://doi.org/10.2196/jmir.9.2.e16 %U http://www.ncbi.nlm.nih.gov/pubmed/17567564

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