This. Most research I see on factors related to activities vs death rate seem to have a pretty big duh! factor--are they healthy enough to be able to do the ac

This. Most research I see on factors related to activities vs death rate seem to have a pretty big duh! factor--are they healthy enough to be able to do the activity and consider it worth the effort it will take to do. There's no way they can possibly control for comorbidities because not everything is in the medical records, nor do medical records have all the details of severity or how it limits someone. Even for things where ability doesn't really enter into it there's also the factor of the level of effort one spends on self-care. If I'm near death am I going to bother with the dentist unless something hurts?