And the situation in medicine is exposed to additional confounding factors - the placebo effect exists (for both faith healers and doctors) and (at least for do

And the situation in medicine is exposed to additional confounding factors - the placebo effect exists (for both faith healers and doctors) and (at least for doctors) has been getting stronger: https://www.scientificamerican.com/article/placebo-effect-grows-in-u-s-thwarting-development-of-painkillers/ https://www.scientificamerican.com/article/placebo-effect-gr... So the effect of the ritual of seeing the doctor and undergoing treatment has increased in strength, possibly as people have grown to trust doctors more.