the time and other resources doctors spend on healthy people is the time and resources that are not spent on sick people. There is a useful number -- NNT that may help you understand how harmful the watch might be. https://www.ted.com/talks/daniel_levitin_how_to_stay_calm_wh...

False positives are not harmless http://theconversation.com/routine-mammograms-do-not-save-li...