Private health insurance and the underinsured.
D003625:Data Collection; D007182:Income; D007348:Insurance, Health / Q000639:trends*; D008489:Medical Indigency / Q000639:trends*; D011203:Poverty; D012306:Risk; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014478:Unemployment; D014481:United States