Comparison of Physical Activity Measures Using Mobile Phone-Based CalFit and Actigraph

David Donaire-Gonzalez   ^{1, 2, 3, 4} , MSc ;   Audrey de Nazelle   ^{1, 2, 3, 5} , PhD ;   Edmund Seto   ⁶ , PhD ;   Michelle Mendez   ^{1, 2, 3, 7} , PhD ;   Mark J Nieuwenhuijsen   ^{1, 2, 3} , PhD ;   Michael Jerrett   ⁶ , PhD

¹ Center for Research in Environmental Epidemiology (CREAL), Barcelona, Catalonia, Spain

² Hospital del Mar Research Institute (IMIM), Barcelona, Catalonia, Spain

³ Spanish Consortium for Research on Epidemiology and Public Health (CIBERESP), Barcelona, Catalonia, Spain

⁴ Physical Activity and Sports Sciences Department, Fundació Blanquerna, Ramon Llull University, Barcelona, Catalonia, Spain

⁵ Center for Environmental Policy, Imperial College London, London, United Kingdom

⁶ Division of Environmental Health Sciences, School of Public Health, University of California, Berkeley, CA, United States

⁷ Department of Nutrition, University of North Carolina, Chapel Hill, NC, United States