California Health Interview Survey


 Join our Newsletter


Join Our Newsletter

A monthly e-mail of breaking news, data, and publications from the Center.

print share

 Comprehensive data

More than 48,000 Californians in every county in the state were surveyed by CHIS in 2013 and 2014, including 40,240 adults, 2,253 adolescents and 5,512 children.

The survey includes samples of Latinos, Asians, and American Indians and representative data for many under-surveyed groups, such as Pacific Islanders. 

Among the respondents are Chinese, Filipinos, Guatemalans, Japanese, Koreans, Mexicans, Salvadorans, South Asians and Vietnamese.



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 2013-2014

CHIS 2011-2012

CHIS 2009

CHIS 2007

CHIS 2005

CHIS 2003

CHIS 2001