Characteristics of Tailored Text Messages Associated With Increased Physical Activity Among Cardiac Rehabilitation Enrollees: Secondary Analysis of a Microrandomized Trial

Namratha Atluri   ^{1 *} , MD ;   Kashvi Gupta   ^{2 *} , MPH, MD ;   Tanima Basu   ³ , MA, MS ;   Evan Luff   ³ , MS ;   Jieru Shi   ⁴ , PhD ;   Thomas Boyden   ⁵ , MD ;   Bhramar Mukherjee   ⁶ , PhD ;   Sachin Kheterpal   ⁷ , MBA, MD ;   Predrag Klasnja   ⁸ , PhD ;   Walter Dempsey   ⁹ , PhD ;   Brahmajee K Nallamothu   ³ , MPH, MD ;   Jessica R Golbus   ³ , MS, MD

¹ Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States

² Division of Nephrology, Department of Internal Medicine, University of California, San Francisco, San Francisco, CA, United States

³ Division of Cardiovascular Diseases, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, United States

⁴ Statistical Laboratory, Department of Pure Mathematics and Mathematical Statistics, University of Cambridge, Cambridge, United Kingdom

⁵ Division of Cardiovascular Diseases, Department of Internal Medicine, Corewell Health, Grand Rapids, MI, United States

⁶ Department of Biostatistics, Yale School of Public Health, New Haven, CT, United States

⁷ Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States

⁸ School of Information, University of Michigan, Ann Arbor, MI, United States

⁹ Department of Biostatistics, School of Public Health, University of Michigan, Ann Arbor, MI, United States

*these authors contributed equally