California Health Interview Survey


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 Hundreds of health statistics

CHIS interviews Californians on hundreds of health topics, including health status, gender identity, substance use and more. 
Learn more about our sample and the questions we ask.

Sample Design


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 2021

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