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2018 Biennial Health Insurance Survey

Underinsured adult looks at coverage options

Country: United States

Survey Organization: SSRS

Field Dates: June 27 to November 11, 2018

Sample:  A random, nationally representative sample of 4,225 adults ages 19 to 64 living in the continental United States

Sample Size:  In all, 725 interviews were conducted with respondents on landline telephones and 3,500 interviews were conducted on cellular phones. The sample was designed to generalize to the U.S. adult population and to allow separate analyses of responses of low-income households. Statistical results are weighted to correct for the stratified sample design, the overlapping landline and cellular phone sample frames, and disproportionate nonresponse that might bias results. The data are weighted to the U.S. adult population by age, sex, race/ethnicity, education, household size, geographic region, population density, and household telephone use, using the U.S. Census Bureau’s 2017 Annual Social and Economic Supplement.

The resulting weighted sample is representative of the approximately 193.9 million U.S. adults ages 19 to 64. The survey has an overall margin of sampling error of +/– 1.9 percentage points at the 95 percent confidence level. The RDD landline portion of the survey achieved a 8.4 percent response rate and the RDD cellular phone component achieved a 5.2 percent response rate.

Interview Method: The survey consisted of telephone interviews in English and Spanish.

Publication Details