www.commonwealthfund.org/Publications/Fund-Reports/2014/Mar/Americas-Underinsured.aspx
"Using newly available data from census surveys, this report provides national and state-level estimates of the number of people and share of the population that were insured but living in households that spent a high share of annual income on medical care in 2011–12. In the analysis, we refer to these people as “underinsured.” However, this group is only one subset of the underinsured."
