The Kaiser Family Foundation Health Insurance Survey was designed and analyzed by researchers at the Kaiser Family Foundation. Fieldwork was conducted by telephone by Princeton Survey Research Associates between April 30 and July 20, 2003, among a sample of 2,507 respondents ages 18 to 64 years. The sample includes 2,042 respondents who are covered by health insurance (including 1,542 who are insured through an employer and 152 who purchase their own insurance), and 457 uninsured respondents. Results for all groups have been weighted to reflect the actual distribution in the nation.
The margin of sampling error for the survey is plus or minus 2 percentage points for total respondents; for respondents with health insurance it is plus or minus 2 percentage points; for respondents insured through an employer it is plus or minus 3 percentage points; for respondents who purchase their own insurance it is plus or minus 9 percentage points; and for uninsured respondents it is plus or minus 5 percentage points. For results based on subsets of respondents the margin of error is higher. Note that sampling error is only one of many potential sources of error in this or any other public opinion poll. Click this link for further details.
