Results: We recruited 8252 study participants. For each method, we calculated the average cost per participant and efficiency, that is, the total number of recruited participants. We defined seven categories of mutually exclusive recruitment methods and used electronic tracking via unique Uniform Resource Locator (URL) and self-reported data to identify the recruitment method for each participant. Online methods comprised advertisements placed on five different websites, including Facebook and Netdoktor.dk.
#DATACAD 19 HATCH ISSUES OFFLINE#
Offline methods included press releases, posters, and flyers. Methods: We employed several online and offline recruitment methods to enroll 18- to 45-year-old women in an Internet-based Danish prospective cohort study on fertility. Objective: The aim of our study was to compare online and offline recruitment methods for Internet-based studies in terms of efficiency (number of recruited participants) and costs per participant. Many different methods are used to recruit participants for such studies, but little is known about how various recruitment methods compare in terms of efficiency and costs.
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JMIR Public Health and Surveillance 669 articles.Journal of Medical Internet Research 5463 articles.