Since falls are still a huge problem for the elderly, though, the USPSTF also examined which interventions could actually work. After all, there were 29 million falls in 2015 alone, and 33,000 deaths resulting from those falls. Vitamin D did nothing. Neither did multifactorial interventions, which would entail preparing a plan for nutrition, mobility exercises, and so on for individual patients. The thing that actually does work is exercise. It was only a modest amount, but it helped even those elderly adults who were at high risk of falling. Exercise reduced the relative risk of a fall to 0.89 (compared to a risk of 1.0 without exercise), and reduced the risk of injurious falls to 0.81 (again, down from a default risk of 1.0). The type of exercise varied a lot between all the studies the USPSTF looked at, but generally included three sessions per week of balance/functional training, resistance work, and flexibility components.