Sample Design
Overview
The California Health Interview Survey (CHIS) is a mixed-mode (web and telephone) survey that uses an address-based sampling (ABS) frame. By using an ABS frame, it is representative of the state's population. Previous to 2019, CHIS was a telephone survey that used a dual-frame random-digit-dial (RDD) technique.
Geographic groups
CHIS data can be analyzed at the county level for the state's 41 most populated counties. The remaining 17 counties are combined into three different groups. See sample design summaries below.
Age groups
CHIS asks questions that are shared across age groups and also some questions that are unique to only one age group: children (0-11 years of age), adolescents (12-17 years of age), and adults (18 years and older).
Race/ethnicity groups
With a large sample of a diverse population, CHIS data have great ability to report on racial/ethnic differences.
CHIS 2019-2020
CHIS 2017-2018
CHIS 2015-2016
CHIS 2013-2014
CHIS 2011-2012
CHIS 2009
CHIS 2007
CHIS 2005
CHIS 2003
CHIS 2001
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