Figure 2. Distribution by frequency of patients with proximal femur fracture (PFF) and controls, according to the duration of physical activity during one day, like walking, working at home, in the garden or in the kitchen, keeping the house etc. The horizontal axis represents the various levels of physical activity depending on the duration (none = elderly individual without any activity; < 4 h/day = elderly individual with up to 4 hours a day of physical activity; > 4 h/day = elderly individual with more than 4 hours a day of physical activity.