12 minutes of vigorous activity weekly linked to mortality reduction similar to 150 minutes of moderate activity

A user says an observational study linked 12 minutes a week of vigorous activity, such as jogging, to the same mortality reduction as 150 minutes of moderate activity, such as walking. They note that guidelines suggest vigorous activity is about twice as effective, while this comparison suggests 12.5 times. They caution that healthier people may be more likely to exercise vigorously, potentially confounding the result.