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Data come from the Commonwealth Fund Biennial Health Insurance Survey (2007), a national telephone survey conducted June 6 through October 24, 2007 among a nationally representative sample of 3,501 adults age 19 and older living in the continental United States. The 25-minute telephone interviews were completed in both English and Spanish, according to the preference of the respondent. The survey achieved a 45-percent response rate (calculated according to the standards of the American Association for Public Opinion Research). The survey sample was drawn using standard list-assisted random digit dialing methodology, which selected telephone numbers disproportionately from area-code/exchange combinations with higher-than-average density of low-income households. Using this stratified sampling design, this study obtained an oversample of low-income, African American and Hispanic adults. To correct for the disproportionate sample design and make the final total sample results representative of all ad
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