A Look Back at 2025

Big Numbers

142,173

queries

More than 140,000 queries were run in AskCHIS™ and AskCHIS™ Neighborhood Edition (NE) in 2025.

25,621

households

The October 2025 release of CHIS 2024 data included responses from 25,621 households, including 24,810 adults, 1,021 adolescents, and 3,733 children.

million+

There are currently 608 total variables and topics and more than 24 million different estimates that can be explored in AskCHIS™.

275+

media hits

CHIS data were featured in local, state, and national news outlets, including LAist, ProPublica, LA Times, Fast Company, and more.

Nearly

2.1

million

Nearly 2.1 million queries have been run in AskCHIS™ and AskCHIS™ Neighborhood Edition (NE) since inception.

More than

130

publications

CHIS data were used or cited in more than 130 publications in 2025 — from peer-reviewed journal articles to policy briefs to government reports.

New and Noteworthy Additions to the 2024 CHIS

Enhancements to gender identity questions: With changes implemented on the gender identity questions, CHIS can now produce estimates of detailed subgroups within the transgender and gender expansive population in California. Based on the 2024 CHIS, approximately 394,000 Californians identify with a transgender or gender expansive identity: 69,000 identify as male or female transgender, 273,000 identify as nonbinary, and 52,000 selected “other gender expansive,” which includes those who identify as transgender, agender, and other gender expansive identities that do not fall under the nonbinary umbrella.

New weighting dimension: Limited English Proficiency (LEP) was added as a dimension in the statistical weighting methods to better represent California’s linguistic diversity.

New questions on hate incidents: More detail about hate incidents experienced or witnessed, such as the number of incidents, impact, supports received, and knowledge of the offender were added to the 2024 CHIS.

We really lean on the CHIS survey and these types of very thoughtful, longitudinal-over-time-looks at what community is experiencing.

Mary Campa

Research and Evaluation Branch Manager
Office of Health Equity, California Department of Public Health

Watch the CHIS Data Release

2024 CHIS by the Numbers

608 total variables/topics

are included in the AskCHIS™ system for 2024

24 million+

different CHIS estimates can be explored in AskCHIS™

1,501 detailed variables

for research in the CHIS 2024 Public Use Files

25,621

households interviewed (24,810 adults, 1,021 adolescents, 3,733 children)

89%

of interviews completed by web

536

total variables/topics are included in the AskCHIS™ system for 2024

6 languages

CHIS is conducted in six languages: English, Spanish, Chinese (Mandarin and Cantonese), Korean, Vietnamese, and Tagalog.

CHIS 2024 Methodology Reports and Papers

In 2025, CHIS released a series of five methodology reports that provide the most in-depth descriptions of CHIS sampling, data collection, data processing, response rates, and weighting and variance estimation methods.

Methodology Reports

Explore the five methodology reports for the 2025 CHIS:

Report 1: 2023-2024 Sample Design — provides analysts with information about the sampling methods used for CHIS 2023–2024, including both the household and person (within household) sampling. This report also provides a discussion on achieved sample size and how it compares to the planned sample size.

Report 2: 2023-2024 Data Collection Methods — describes the protocols followed to contact sampled addresses and how data were collected for CHIS 2023–2024, including details on procedures to complete the child and adolescent extended interview and outcomes of sampled addresses and quality control measures.

Report 3: 2023-2024 Data Processing Procedures — describes the data processing and editing procedures for CHIS 2023–2024. The report details the data editing procedures and addresses the steps taken for ensuring data quality, delivery of the final data sets, special procedures of editing and coding of geography and race and ethnicity survey items, and more.

Report 4: 2023-2024 Response Rates — provides analysts with information about the response rates in CHIS 2023–2024, as well as procedures used to increase the response rates.

Report 5: 2023-2024 Weighting and Variance Estimation — describes the weighting and variance estimation methods used in CHIS 2023–2024 and presents the steps used to create the analytical weights for analyzing the data from the adult, child, and adolescent interviews.

AskCHIS™

AskCHIS™ was updated in October 2025 with the full 2024 CHIS data.

As CHIS' most comprehensive tool, AskCHIS™ draws upon the responses of 20,000+ California households interviewed each year and provides data on a wide range of health topics across many sociodemographic factors. Users are able to quickly search for health statistics by county, region, and state.

Currently, there are approximately 24 million+ different CHIS estimates that can be explored in AskCHIS™.

AskCHIS™ By the Numbers

101,504

queries run in AskCHIS™ in 2025

1,986,047

queries run in AskCHIS™ since inception

9,584

total AskCHIS™ users in 2025

AskCHIS™ NE

Using a sophisticated modeling technique called Small Area Estimation (SAE), AskCHIS™ NE provides local health departments, policymakers, legislators, community organizations, researchers, and other stakeholders the data needed to target health interventions based on a neighborhood’s specific needs.

AskCHIS™ NE By the Numbers

40,006

queries run in AskCHIS™ NE in 2025

112,287

queries run in AskCHIS™ NE since inception

853

total AskCHIS™ NE users in 2025

Public Use Files (PUF)

In 2025, CHIS released several new Public Use Files (PUFs):

2024 One-Year PUF
One-year PUFs consist of individual records obtained from each survey year (CHIS 2001–2024), contain comprehensive data on a large range of topics at the state level, and include variables that minimize the risk of indirect identification of CHIS respondents.

2024 Long-Term Services and Supports (LTSS) PUF
The Long-Term Services and Supports (LTSS) Study PUFs contain a set of questions assessing experiences of Californians who have difficulties with certain activities of daily life, such as dressing, bathing, walking, or doing errands. The 2024 LTSS PUF was released in November 2025, adding to the 2019, 2020, and 2023 LTSS PUFs. CHIS has also released revised data for the 2023 LTSS PUF.

Learn more about Public Use Files (PUFs)...

CHIS Data Access Center (DAC)

The CHIS Data Access Center (DAC) provides researchers with the ability to analyze confidential CHIS data while maintaining the data in a secure, controlled environment that protects the confidentiality of respondents.

In 2025, CHIS launched a new DAC Project Depot, where users can browse through previously submitted DAC projects and explore topics of interest, learn about already-conducted research, and get ideas for where new research using CHIS data would be valuable.

Learn more about DAC...

CHIS in College Campuses Around the Country

CHIS isn’t just shaping statewide health policy — it’s fueling innovation and inquiry on college campuses across the nation and beyond. From undergraduate theses to doctoral dissertations, students are leveraging CHIS data to explore critical issues like health inequities, immigrant experiences, and food insecurity.

Beyond academia, CHIS insights are making headlines in student-run newspapers and national media collaborations. From the Daily Bruin’s coverage of health disparities to the USC Center for Health Journalism’s investigative reporting projects, CHIS continues to empower the next generation of scholars and storytellers to illuminate the health challenges shaping our communities.

This year’s CHIS data release and data user trainings were attended by students from more than two dozen colleges and universities across the U.S. — from California to Hawaii, New York, Georgia, Indiana, Maryland, and North Carolina, and all the way across the pond to the UK and India.