How Notifications Affect Engagement With a Behavior Change App: Results From a Micro-Randomized Trial

Lauren Bell   ^{1, 2} , MSc ;   Claire Garnett   ³ , PhD ;   Yihan Bao   ⁴ , MA ;   Zhaoxi Cheng   ⁵ , BSc ;   Tianchen Qian   ⁶ , PhD ;   Olga Perski   ³ , PhD ;   Henry W W Potts   ⁷ , PhD ;   Elizabeth Williamson   ¹ , PhD

¹ Department of Medical Statistics, The London School of Hygiene and Tropical Medicine, London, United Kingdom

² Medical Research Council Biostatistics Unit, University of Cambridge, Cambridge, United Kingdom

³ Research Department of Behavioural Science and Health, University College London, London, United Kingdom

⁴ Department of Statistics and Data Science, Yale University, New Haven, CT, United States

⁵ Department of Biostatistics, Harvard University, Cambridge, MA, United States

⁶ Department of Statistics, University of California Irvine, Irvine, CA, United States

⁷ Institute of Health Informatics, University College London, London, United Kingdom