Assessing User Engagement of an mHealth Intervention: Development and Implementation of the Growing Healthy App Engagement Index

Sarah Taki   ^{1, 2} , PhD ;   Sharyn Lymer   ^{1, 3} , PhD ;   Catherine Georgina Russell   ^{1, 4} , PhD ;   Karen Campbell   ^{1, 4} , PhD ;   Rachel Laws   ^{1, 4} , PhD ;   Kok-Leong Ong   ⁵ , PhD ;   Rosalind Elliott   ² , PhD ;   Elizabeth Denney-Wilson   ^{1, 2} , PhD

¹ Centre for Obesity Management and Prevention Research Excellence in Primary Health Care, Sydney, Australia

² Centre for Midwifery, Child and Family Health, University of Technology Sydney, Sydney, Australia

³ Department of Physiotherapy, University of Sydney, Sydney, Australia

⁴ Deakin University, Victoria, Australia

⁵ Latrobe University, Melbourne, Australia