Obviously that will be the case to some extent, but it doesn't necessarily explain the whole effect, given this part:
> Dose-response meta-analysis indicated a strong inverse association, wherein the risk decreased linearly from 2700 to 17,000 steps per day.
I expect (especially in the US) that many or even most people who could walk several thousand steps a day, don't. They talk about the 70+ age group separately, but most of it is talking about the general population and says the relationship holds.
Of course, this meshes with what we already know about the clear links to exercise causing better health - not just things like balance, less risk of injury, bone density etc. in older people but for anybody prevention of or improvements to things like non-alcoholic fatty liver disease (combined with diet), improvements for those with metabolic syndrome, etc. which all contribute to a lot of early mortality.
> Dose-response meta-analysis indicated a strong inverse association, wherein the risk decreased linearly from 2700 to 17,000 steps per day.
I expect (especially in the US) that many or even most people who could walk several thousand steps a day, don't. They talk about the 70+ age group separately, but most of it is talking about the general population and says the relationship holds.
Of course, this meshes with what we already know about the clear links to exercise causing better health - not just things like balance, less risk of injury, bone density etc. in older people but for anybody prevention of or improvements to things like non-alcoholic fatty liver disease (combined with diet), improvements for those with metabolic syndrome, etc. which all contribute to a lot of early mortality.