U.S. residents with health insurance and relatively high incomes are having a harder time paying medical bills.
Researchers at the Center for Studying Health System Change, Washington, have published that finding in a summary of results from a 2007 survey of 18,000 U.S. residents.
About 18% of the survey participants with health insurance reported having problems with medical bills in 2007, up from 14% in 2003, the researchers report.