Optimizing Self-Monitoring in a Digital Weight Loss Intervention (Spark): Protocol for a Factorial Randomized Trial

Michele L Patel   ¹ , PhD ;   Abby C King   ^{1, 2} , PhD ;   Lisa G Rosas   ^{2, 3} , MPH, PhD ;   Gary G Bennett   ⁴ , PhD ;   Linda M Collins   ⁵ , PhD ;   John A Gallis   ^{6, 7} , ScM ;   Amanda B Zeitlin   ¹ , MPH ;   Priya S Talreja   ¹ , MS, MHS ;   Phoebe C Crosthwaite   ¹ , MS ;   Kayla A Collins   ¹ , BA ;   Annalisa W Lim   ¹ , BS ;   Trudy S Kim   ¹ , BS

¹ Department of Medicine, Stanford Prevention Research Center, School of Medicine, Stanford University, Palo Alto, CA, United States

² Department of Epidemiology and Population Health, School of Medicine, Stanford University, Palo Alto, CA, United States

³ Department of Medicine, Division of Primary Care and Population Health, School of Medicine, Stanford University, Palo Alto, CA, United States

⁴ Department of Psychology and Neuroscience, Trinity College of Arts & Sciences, Duke University, Durham, NC, United States

⁵ Department of Social and Behavioral Sciences, School of Global Public Health, New York University, New York, NY, United States

⁶ Duke Global Health Institute, Duke University, Durham, NC, United States

⁷ Department of Biostatistics and Bioinformatics, Duke University, Durham, NC, United States