Baines Alisha D, Partin Melissa R, Davern Michael, Rockwood Todd H
Center for Chronic Disease Outcomes Research, Department of Veterans Affairs Medical Center, One Veteran's Drive 152/2E, Minneapolis, MN 55417, USA.
J Clin Epidemiol. 2007 Dec;60(12):1246-55. doi: 10.1016/j.jclinepi.2007.02.011. Epub 2007 Jun 29.
To assess whether a mixed-mode survey design reduced bias and enhanced methods commonly used to correct for bias (poststratification weighting).
The data for this paper are from a study of 1,900 adult patients enrolled in a randomized controlled trial to promote repeat treatment for relapsed smokers at five Veteran's Affairs Medical Centers. A sequential mixed-mode design was used for data collection whereby the initial attempt was conducted using phone administration, with mail follow-up for nonresponders. Analyses examined demographic, health, and smoking cessation treatment seeking differences between telephone responders, mail responders, and nonresponders and compared the relative effectiveness of global vs. targeted poststratification weighting adjustments for correcting for response bias.
The findings suggest (1) that responders to the additional survey mode (mail) did not significantly differ from responders to the first mode (phone) or nonresponders and (2) that poststratification weighting adjustments that take this additional information into account perform better than the standard global adjustments.
A mixed-mode design can improve survey representativeness and enhance the performance of poststratification weighting adjustments.
评估混合模式调查设计是否能减少偏差，并增强常用于校正偏差的方法（事后分层加权）。
本文数据来自一项针对1900名成年患者的研究，这些患者参与了一项随机对照试验，该试验旨在促进在五个退伍军人事务医疗中心对复吸吸烟者进行重复治疗。数据收集采用了序贯混合模式设计，即首先通过电话进行初次尝试，对未回应者采用邮件跟进。分析考察了电话回应者、邮件回应者和未回应者在人口统计学、健康状况以及寻求戒烟治疗方面的差异，并比较了全局与针对性事后分层加权调整在校正回应偏差方面的相对有效性。
研究结果表明：（1）额外调查模式（邮件）的回应者与第一种模式（电话）的回应者或未回应者没有显著差异；（2）考虑了这些额外信息的事后分层加权调整比标准的全局调整表现更好。
混合模式设计可以提高调查的代表性，并增强事后分层加权调整的效果。
