Engagement and Retention: Measuring Breadth and Depth of Participant Use of an Online Intervention

Mick P Couper   ^{1 * †} , PhD ;   Gwen L Alexander   ^{2 * †} , PhD MPH ;   Noel Maddy   ^{2 * †} ;   Nanhua Zhang   ^{3 * †} , MS PhD Candidate ;   Michael A Nowak   ^{4 * †} , MLIS ;   Jennifer B McClure   ^{5 * †} , PhD ;   Josephine J Calvi   ^{6 * †} , MPH ;   Sharon J Rolnick   ^{7 * †} , PhD ;   Melanie A Stopponi   ^{8 * †} , MPA ;   Roderick JA Little   ^{3 * †} , PhD ;   Christine Cole Johnson   ^{2 * †} , PhD MPH

¹ University of Michigan, Survey Research Center, Ann Arbor, United States

² Henry Ford Hospital and Health System, Detroit, United States

³ Unversity of Michigan, School of Public Health, Ann Arbor, United States

⁴ University of Michigan, Center for Health Communications Research, Ann Arbor, United States

⁵ Group Health Research Institute, Seattle, United States

⁶ Kaiser Permanente Georgia, Health Research Center, Atlanta, United States

⁷ Health Partners, Health Services Research Center, Minneapolis, United States

⁸ Kaiser Permanente Colorado, Health Research Center, Denver, United States

*all authors contributed equally