Physical activity
Level of physical activity was expressed in average number of steps per day as assessed by a hip-worn pedometer. Participants were provided with one of the four following types of pedometers: the Omron walking style II, IV, and One 2.0 (Omron Healthcare Co. Ltd., Dallian, China), and the Yamax Digiwalker (SW-200, Yamasa Tokei Keiki Co. Ltd., Tokyo, Japan). All models use 3-axis technology to register ambulatory motion and have demonstrated good and comparable validity in free-living conditions [