I disagree, but GDP per capita is an important statistic to consider as well.
Since health insurance is measured in "lives," overall population of a "group" is one of the most important factors when considering how overarching a policy or regulation can be. There are thousands of factors, probably more, but really any guiding principle, in any capacity, becomes increasingly less precise as it applies to larger populations.
I'll stop there, as I am not officially recognized by either major actuarial society.