Boosting Physical Activity Among Individuals With Low Engagement Through Double-Point Incentives in a Community-Based mHealth Intervention: Retrospective Observational Study

Jungin Joo   ^{1, 2, 3 *} , PhD ;   Mangyeong Lee   ^{1, 2, 4 *} , PhD ;   Junghee Yoon   ^{4, 5} , PhD ;   Hyeonjin Cho   ^{1, 2} , MD ;   Govind Warrier   ^{6, 7} , MPH, MD ;   Johannes Thrul   ^{3, 8, 9} , PhD ;   Juhee Cho   ^{1, 2, 4, 10} , PhD

¹ Department of Digital Health, Samsung Advanced Institute for Health Sciences & Technology, Sungkyunkwan University, Seoul, Republic of Korea

² Center for Clinical Epidemiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea

³ Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States

⁴ Department of Clinical Research Design and Evaluation, Samsung Advanced Institute for Health Sciences & Technology, Sungkyunkwan University, Seoul, Republic of Korea

⁵ Samsung Medical Center, Patient-Centered Outcomes Research Institute, Seoul, Republic of Korea

⁶ Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD, United States

⁷ Bloomberg-Kimmel Institute for Cancer Immunotherapy and Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, Baltimore, MD, United States

⁸ Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD, United States

⁹ Centre for Alcohol Policy Research, La Trobe University, Melbourne, Australia

¹⁰ Department of Health, Behavior and Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States

*these authors contributed equally