If you are chronically ill, you are going to have "costs" beyond whatever such studies measure as 'healthcare costs'. I was unemployable for year and years until I finally got a proper diagnosis and began getting my condition under control. The single biggest cost savings I have experienced with getting well is that my food budget has shrunk dramatically. My ex was career military. I had very few out-of-pocket "medical" expenses (co-pays for doctor's visits or for prescription drugs). My health problems did enormous damage to our budget anyway. Anyone spending in the neighborhood of 20% of their income on medical care is not healthy. Please see my other reply if you really want to read more of my rant on the topic.

Peace.