Performance of the Swiss Digital Contact-Tracing App Over Various SARS-CoV-2 Pandemic Waves: Repeated Cross-sectional Analyses

Paola Daniore   ^{1, 2} , MSc ;   Vasileios Nittas   ³ , PhD ;   Tala Ballouz   ³ , MD ;   Dominik Menges   ³ , MD, PhD ;   André Moser   ⁴ , PhD ;   Marc Höglinger   ⁵ , Prof Dr ;   Petra Villiger   ⁶ , MSc ;   Krisztina Schmitz-Grosz   ⁶ , MD ;   Viktor Von Wyl   ^{1, 2, 3} , Prof Dr

¹ Institute for Implementation Science in Healthcare, University of Zurich, Zurich, Switzerland

² Digital Society Initiative, University of Zurich, Zurich, Switzerland

³ Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland

⁴ Clinical Trials Unit, University of Bern, Bern, Switzerland

⁵ Winterthur Institute of Health Economics, Zurich University of Applied Sciences, Winterthur, Switzerland

⁶ Medgate Aktiengesellschaft, Basel, Switzerland