This report provides comparable estimates for the percentage of persons under age 65 who were in families having problems paying medical bills,by selected demographic variables based on data from three consecutive 6-month periods from January-June 2011 to January-June 2012 of the National Health Interview Survey (NHIS). In this report, an NHIS "family" is defined as an individual or a group of two or more related persons living together in the same housing unit. Thus, and a family can consist of only one person. In some instances,unrelated persons sharing the same household may also be considered as one family, such as an single couple living together.
Source: cdc.gov