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Every two years, the California Health Interview Survey conducts telephone interviews with 40,000 to more than 50,000 California households. The persons included in CHIS are a statistically representative sample of the entire state's diverse population living in households.
With each survey cycle, CHIS newly selects households to participate in the survey. Beginning in 2007, CHIS also includes a sample of cell-phone numbers.
Computers randomly draw telephone numbers for 44 geographic areas that represent 41 individual counties and 3 groupings of counties with smaller populations. For each geographic area, CHIS has a targeted minimum number of people to include.
When CHIS contacts a household, one adult is randomly selected to be interviewed. Only that selected person can participate in each household. If there are minor children in the household, CHIS also asks questions about the adolescents and younger children.
Additionally, CHIS uses many techniques to interview enough people from many ethnic groups to provide a strong basis for understanding most major and minor racial and ethnic populations that all are a part of California. Each cycle, thousands of CHIS interviews are conducted in languages other than English.
These downloadable tables show the number of people CHIS has interviewed for each county and race/ethnicity:
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