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American Journal of Epidemiology Advance Access originally published online on August 28, 2007
American Journal of Epidemiology 2007 166(11):1345-1354; doi:10.1093/aje/kwm212
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American Journal of Epidemiology Published by the Johns Hopkins Bloomberg School of Public Health 2007.

PRACTICE OF EPIDEMIOLOGY

When Epidemiology Meets the Internet: Web-based Surveys in the Millennium Cohort Study

Besa Smith1, Tyler C. Smith1, Gregory C. Gray2, Margaret A. K. Ryan1 and for the Millennium Cohort Study Team

1 Department of Defense Center for Deployment Health Research, Naval Health Research Center, San Diego, CA
2 College of Public Health, University of Iowa, Iowa City, IA

Correspondence to Dr. Besa Smith, Department of Defense Center for Deployment Health Research, Naval Health Research Center, P.O. Box 85122, San Diego, CA 92186-5122 (e-mail: Besa.Smith{at}med.navy.mil).

Received for publication March 1, 2007. Accepted for publication June 19, 2007.

Almost 60% of American households were connected to the Internet in 2001, when the Millennium Cohort Study, the largest longitudinal study ever undertaken by the Department of Defense, was launched. To facilitate survey completion, increase data integrity, and encourage cohort retention while maintaining the highest standards of participant privacy, an online questionnaire was made available on the World Wide Web in addition to a traditional paper questionnaire sent via US mail. Over 50% of 77,047 participants chose to enroll in the study via the Web, affording substantial cost savings to the project. Using multivariable logistic regression, the authors compared the demographic and health characteristics of Web responders with those of paper responders. Web responders were slightly more likely to be male, to be younger, to have a high school diploma or college degree, and to work in information technology or another technical occupation. Web responders were more likely to be obese and to smoke more cigarettes and were less likely to be problem alcohol drinkers and to report occupational exposures. Question completion rates were 98.3%, on average, for both Web and paper responders. Web responders provided more complete contact information, including their e-mail addresses. These results demonstrate the value of survey research conducted over the Internet in concert with traditional mail survey strategies.

data collection; epidemiologic methods; health surveys; Internet; longitudinal studies; military personnel; questionnaires

Abbreviations: CI, confidence interval; OR, odds ratio


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