A Smartphone-Based Timed Up and Go Test Self-Assessment for Older Adults: Validity and Reliability Study

Melissa Johanna Böttinger   ^{1, 2} , MSc ;   Sabato Mellone   ³ , PhD ;   Jochen Klenk   ^{4, 5} , Prof Dr ;   Carl-Philipp Jansen   ¹ , PhD ;   Marios Stefanakis   ⁶ , MSc ;   Elena Litz   ^{1, 2} , MSc ;   Anastasia Bredenbrock   ² , BSc ;   Jan-Philipp Fischer   ⁷ , MA ;   Jürgen M Bauer   ^{1, 2} , MD ;   Clemens Becker   ¹ , MD ;   Katharina Gordt-Oesterwind   ^{1, 2, 8} , PhD

¹ Geriatric Center, Medical Faculty Heidelberg, Heidelberg University, Heidelberg, Germany

² Network Aging Research, Heidelberg University, Heidelberg, Germany

³ Department of Electrical, Electronic and Information Engineering, University of Bologna, Bologna, Italy

⁴ Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany

⁵ Study Center Stuttgart, IB University of Health and Social Sciences, Stuttgart, Germany

⁶ Department of Clinical Gerontology and Geriatric Rehabilitation, Robert Bosch Hospital, Stuttgart, Germany

⁷ TSG ResearchLab gGmbH, Zuzenhausen, Germany

⁸ Institute of Sports and Sports Sciences, Heidelberg University, Heidelberg, Germany