Website Usage and Weight Loss in a Free Commercial Online Weight Loss Program: Retrospective Cohort Study

Kevin O. Hwang   ^{1, 2} , MD, MPH ;   Jing Ning   ³ , PhD ;   Amber W. Trickey   ^{1, 2} , PhD ;   Christopher N. Sciamanna   ⁴ , MD, MPH

¹ Department of Internal Medicine, The University of Texas Medical School at Houston, Houston, TX, United States

² The University of Texas at Houston - Memorial Hermann Center for Healthcare Quality and Safety, Houston, TX, United States

³ Department of Biostatistics, The University of Texas M.D. Anderson Cancer Center, Houston, TX, United States

⁴ Department of Medicine, Penn State College of Medicine, Hershey, PA, United States