@Article{信息:doi 10.2196 / / jmir.8.3。e15，作者=“Danaher, Brian G和Boles, Shawn M和Akers, Laura和Gordon, Judith S和Severson, Herbert H”，标题=“定义基于web的健康行为改变计划中的参与者暴露测量”，期刊=“J Med Internet Res”，年=“2006”，月=“8”，日=“30”，卷=“8”，数=“3”，页=“e15”，关键词=“健康行为”;互联网;网络;行为研究;参与者暴露;背景:发表的关于使用基于网络的行为改变项目的研究正在迅速增长。在这些研究中，一个有问题的观察结果是，参与者经常相对较少地访问网站，并且只花很短的时间访问程序。结构合理的网站允许对参与者访问(接触)节目内容的方式进行不显眼的测量。对参与者参与网络项目的研究不仅是技术人员感兴趣的，而且代表了一个重要的机会，可以更好地理解项目参与的更广泛主题，并指导开发更有效的干预措施。 Objectives: The current paper seeks to provide working definitions and describe initial patterns of various measures of participant exposure to ChewFree.com, a large randomized controlled trial of a Web-based program for smokeless tobacco cessation. Methods: We examined measures of participant exposure to either an Enhanced condition Web-based program (interactive, tailored, and rich-media program) or a Basic condition control website (static, text-based material). Specific measures focused on email prompting, participant visits (number, duration, and pattern of use over time), and Web page viewing (number of views, types of pages viewed, and Web forum postings). Results: Participants in the ChewFree.com Enhanced condition made more visits and spent more time accessing their assigned website than did participants assigned to the Basic condition website. In addition, exposure data demonstrated that Basic condition users thoroughly accessed program content, indicating that the condition provided a meaningful, face-valid control to the Enhanced condition. Conclusions: We recommend that researchers conducting evaluations of Web-based interventions consider the collection and analysis of exposure measures in the broader context of program engagement in order to assess whether participants obtain sufficient exposure to relevant program content. ", issn="1438-8871", doi="10.2196/jmir.8.3.e15", url="//www.mybigtv.com/2006/3/e15/", url="https://doi.org/10.2196/jmir.8.3.e15", url="http://www.ncbi.nlm.nih.gov/pubmed/16954125" }