Rankin Kristin M, Rauscher Garth H, McCarthy Bridget, Erdal Serap, Lada Pat, Il'yasova Dora, Davis Faith
Division of Epidemiology, University of Illinois at Chicago, 1603 West Taylor Street (m/c 923), Chicago, IL 60612, USA.
Cancer Epidemiol Biomarkers Prev. 2008 Oct;17(10):2639-46. doi: 10.1158/1055-9965.EPI-08-0304.
To determine whether a Web-based survey was an acceptable method of data collection for a clinic-based case-control study of adult brain cancer, the authors compared the reliability of paired responses to a main and resurvey for participants completing surveys by telephone (n=74) or self-administered on the Web (n=465) between 2003 and 2006.
Recruitment of cases was done at the Evanston Northwestern Healthcare Kellogg Cancer Care Center and the Duke University Medical Center Cancer Control division, and controls were friends and siblings of cases. Twenty-five variables were examined, including smoking, oral contraceptive and residential histories, water sources, meat preparation, fruit and vegetable consumption, and pesticide use. Weighted and simple kappa's were estimated for categorical and binary variables, respectively.
The number of concordant paired responses was summed for use in linear regression. Respondents were 97% White and 85% had postsecondary education. Kappa's for individual questions ranged from 0.31 (duration of residence in a single family house) to 0.96 (ever smoked), with a median of 0.57 (95% confidence interval, 0.47-0.64). The median number of concordant responses was 16.2 (range, 5-22). Reliability was greater for controls than cases, Web-based versus telephone responders, females, and higher-income responders. Frequency of e-mail and Internet use was not associated with reliability.
A self-administered, Web-based survey was a feasible and appropriate mode of interview in this study. The comparable reliability of Web compared with telephone responses suggest that Web-based self-interviews could be a cost-effective alternative to traditional modes of interview.
为了确定基于网络的调查是否是成人脑癌临床病例对照研究中可接受的数据收集方法，作者比较了2003年至2006年间通过电话完成调查的参与者（n = 74）或在网络上自行完成调查的参与者（n = 465）对主要调查和重新调查的配对回答的可靠性。
病例招募在埃文斯顿西北医疗凯洛格癌症护理中心和杜克大学医学中心癌症控制部门进行，对照为病例的朋友和兄弟姐妹。检查了25个变量，包括吸烟、口服避孕药和居住史、水源、肉类制备、水果和蔬菜消费以及农药使用。分别对分类变量和二元变量估计加权kappa系数和简单kappa系数。
将一致的配对回答数量相加用于线性回归。受访者97%为白人，85%拥有高等教育学历。单个问题的kappa系数范围从0.31（在独栋房屋中的居住时长）到0.96（曾经吸烟），中位数为0.57（95%置信区间，0.47 - 0.64）。一致回答的中位数为16.2（范围，5 - 22）。对照、基于网络的受访者与电话受访者相比、女性以及高收入受访者的可靠性更高。电子邮件和互联网使用频率与可靠性无关。
在本研究中，自行完成的基于网络的调查是一种可行且合适的访谈方式。与电话回答相比，网络回答具有可比的可靠性，这表明基于网络的自我访谈可能是传统访谈方式具有成本效益的替代方法。
