Mobile Phone-Based Measures of Activity, Step Count, and Gait Speed: Results From a Study of Older Ambulatory Adults in a Naturalistic Setting

Cassia Rye Hanton   ^{1 *} , BS ;   Yong-Jun Kwon   ^{2 *} , BS ;   Thawda Aung   ² , BS ;   Jackie Whittington   ¹ ;   Robin R High   ³ , MBA, MA ;   Evan H Goulding   ⁴ , MD, PhD ;   A Katrin Schenk   ² , PhD ;   Stephen J Bonasera   ¹ , MD, PhD

¹ University of Nebraska Medical Center, Department of Internal Medicine, Division of Geriatrics, Omaha, NE, United States

² Randolph College, Department of Physics, Lynchburg, VA, United States

³ University of Nebraska Medical Center, College of Public Health, Department of Biostatistics, Omaha, NE, United States

⁴ Northwestern University, Department of Psychiatry and Behavioral Sciences, Chicago, IL, United States

*these authors contributed equally