What he found was that the funding mechanism of health care over that time had shifted from patients paying out of pocket to government paying hospitals and government incentivized (by making it a tax write off for employers) and regulated (by preventing efficient pools of insured with state-by-state regulations) insurance.
Consequently, not only did the availability of health care go down, but the costs went up 26fold.
Or put another way, despite massive improvements in technology, medicine and productivity over 70+ years, costs skyrocketed from what you could afford out of pocket to what would bankrupt you. To put it in 2013 dollars, if you hypothesize a $100,000 surgery, in 1970[1] it would cost you $100,000, and you'd need insurance or go bankrupt, but in 1900 it would have cost you $3,846 (an amount you could put on credit cards today.)
Command economies don't work, and the change in health care over the last century has been a centralization in control. I with Obamacare this has dramatically ramped up and now there are boards to decide who gets what care based on cost measures, rather than medical need.
Whenever someone talks about the need for socialized medicine because "otherwise people would go bankrupt", remember it is the socialization of medicine that caused costs to rise to the point where people would go bankrupt.
[1] The study was originally done in the 1970s, but I'm using 2013 dollars here so you can understand how cheap things would have been.