Adherence
Personalized direct mail invitations significantly increase enrollment rates in internet-based weight loss programs compared to general newsletter announcements.
If you are designing a digital health program, do not rely on passive announcements like newsletters. Use personalized, direct mail from a trusted source (like a physician or prevention director) to significantly boost initial sign-ups, especially for high-risk groups.
Bivariate analyses on aggregate data revealed that personalized mailings produced higher enrollment rates than member newsletters... A single personalized mailing increases enrollment in Internet-based weight loss.
Why this rating
Randomized controlled trial design with large sample size (N=2311), though enrollment analysis used aggregate data for non-enrollees.
Source
Reach, Engagement, and Retention in an Internet-Based Weight Loss Program in a Multi-Site Randomized Controlled Trial
Russell E. Glasgow et al. · Journal of Medical Internet Research · 2007
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