Published Papers - Abstract 1039

Loxton D, Harris ML, Forder P, Powers J, Townsend N, Byles J, & Mishra G. Factors Influencing Web-Based Survey Response for a Longitudinal Cohort of Young Women Born Between 1989 and 1995. Journal of Medical Internet Research, 2019; 21(3): e11286

Background: With health research practices shifting toward rapid recruitment of samples through the use of online approaches,little is known about the impact of these recruitment methods on continued participation in cohort studies.Objective: This study aimed to report on the retention of a cohort of young women who were recruited using an open recruitmentstrategy.Methods: Women from the 1989-95 cohort of the Australian Longitudinal Study on Women’s Health, recruited in 2012 and2013 were followed up annually via Web-based surveys in 2014, 2015, and 2016. Prevalence ratios for survey response werecalculated using log-binomial models with generalized estimating equations including demographic, health-related, and recruitmentmethod characteristics examined as explanatory factors.Results: Of the 17,012 women who completed the baseline survey (Survey 1) in 2012 to 2013, approximately two-thirdscompleted Survey 2 (2014), and just over half completed Surveys 3 (2015) and 4 (2016). Women demonstrated transient patternsof responding with 38.21% (6501/17,012) of women completing all 4 surveys. Although retention of young women was associatedwith older age, higher education, higher self-rated health status, and low engagement with adverse health behaviors, the methodof recruitment was a key determinant of study participation in the multivariate model. Although women were more likely to berecruited into the cohort via social media (eg, Facebook), retention over time was higher for women recruited through traditionalmedia and referral approaches.Conclusions: A balance must be obtained between achieving representativeness, achieving rapid cohort recruitment, andmitigating the pitfalls of attrition based on recruitment method in the new era of cohort studies, where traditional recruitmentmethods are no longer exclusively viable options

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