California Health Interview Survey


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 Hundreds of health statistics

CHIS interviews Californians on hundreds of health topics. Half of the CHIS 2017 adult interviews were conducted from landline phone number and half from cell phone numbers. CHIS interviewed residents with out-of-state cell phone number to better capture people who recently moved to California.
Learn more about our sample and the questions we ask.

Sample Design


The California Health Interview Survey (CHIS) is a telephone survey that uses a dual-frame random-digit-dial (RDD) technique. By using traditional landline RDD and cell-phone RDD sampling frames, it is representative of the state's population. A supplemental surname list frame is used to ensure representation of the Korean and Vietnamese households.

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 2017-2018

CHIS 2015-2016

CHIS 2013-2014

CHIS 2011-2012

CHIS 2009

CHIS 2007

CHIS 2005

CHIS 2003

CHIS 2001