Optimizing Engagement With a Smartphone App to Prevent Violence Against Adolescents: Results From a Cluster Randomized Factorial Trial in Tanzania

Roselinde Janowski   ¹ , MA ;   Lucie D Cluver   ^{1, 2} , DPhil ;   Yulia Shenderovich   ^{3, 4} , PhD ;   Joyce Wamoyi   ⁵ , PhD ;   Mwita Wambura   ⁵ , PhD ;   David Stern   ⁶ , PhD ;   Lily Clements   ⁶ , PhD ;   G J Melendez-Torres   ⁷ , DPhil ;   Lauren Baerecke   ⁸ , MA ;   Abigail Ornellas   ⁸ , PhD ;   Angelique Nicole Chetty   ⁸ , BA ;   Jonathan Klapwijk   ¹ , MA ;   Laetitia Christine   ⁹ , BSc ;   Ateamate Mukabana   ⁹ , BSc ;   Esmee Te Winkel   ⁶ , PhD ;   Anna Booij   ¹⁰ , MA ;   Gervas Mbosoli   ⁵ , BSc ;   Jamie M Lachman   ^{1, 8, 11} , DPhil

¹ Department of Social Policy and Intervention, University of Oxford, Oxford, United Kingdom

² Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa

³ Centre for Development, Evaluation, Complexity, and Implementation in Public Health Improvement (DECIPHer), School of Social Sciences, Cardiff University, Cardiff, United Kingdom

⁴ Wolfson Centre for Young People’s Mental Health, Cardiff University, Cardiff, United Kingdom

⁵ Mwanza Research Centre, National Institute for Medical Research, Mwanza, United Republic of Tanzania

⁶ Innovations in Development, Education and the Mathematical Sciences (IDEMS) International, Reading, United Kingdom

⁷ Faculty of Health and Life Sciences, University of Exeter, Exeter, United Kingdom

⁸ Centre for Social Science Research, University of Cape Town, Cape Town, South Africa

⁹ Innovations in Development, Education and the Mathematical Sciences (INNODEMS), Kakamega, Kenya

¹⁰ Clowns Without Borders South Africa, Cape Town, South Africa

¹¹ Parenting for Lifelong Health, Oxford, United Kingdom