How California's sub-state numbers were produced

Everything on the California State Explorer comes from the state-published sources below, loaded as published. The dashboard computes nothing from them; it carries each publisher's own confidence intervals and suppression.

Number of adverse childhood experiences (8 point scale), adults, by county and region

UCLA Center for Health Policy Research, AskCHIS. California Health Interview Survey. Direct estimate. Retrieved 2026-10-27 (tool export; sha256 aeccfb886cba…). Publisher's page

The direct county series. AskCHIS answers one variable, geography set and year selection per query and exports each as an .xlsx; the raw file is those exports flattened by scripts/substate/askchis-xlsx.ts (one row per cell, with each export's sha256). Twenty exports of the 8-point variable on 2026-10-27: all 44 counties and county groups for 2024+2025 and for 2022+2023; the seven regions and the state for those two pooled windows and each single year 2021 to 2025; and the regions by age, sex, race, education and poverty level for both windows (those cross-tabs are not loaded: AskCHIS publishes no breakdowns below the regions, so on a map of counties they would show for Los Angeles County alone). One export of the 11-item variable is in the raw folder for reference and is not loaded. The 'Los Angeles County' region column is loaded as Los Angeles County. Only periods with a county export are loaded (2022+2023 and 2024+2025), so the map shows the same 44 areas in every period it offers; the single-year region tables stay in the raw file until counties are exported for them.

Survey years and pooling	Two pooled windows, survey years 2022+2023 and 2024+2025, for the counties, the regions and the state alike. AskCHIS pools years as population-weighted averages of each year's estimate and variance.
Weighting and estimation	CHIS's own survey weights, raked to California's population by county: the sample is drawn and weighted at the county level, with small counties sampled as three multi-county groups. Estimates are direct weighted tabulations of respondents, not modeled.
Suppression rule	AskCHIS prints '-' with the footnote '- suppressed due to small sample size' (its technical note: a cell whose population estimate is below 500). Those cells are loaded as suppressed. It prints an asterisk and the footnote '* statistically unstable' on a cell whose coefficient of variation is 30% or more and 'recommends against reporting or relying on' such estimates; the dashboard follows that advice and loads flagged cells as suppressed too, with the flag as the reason. No loaded cell is flagged or withheld; both occur only in the regional breakdowns, which are not loaded.
Reliability	A 95% confidence interval and a weighted population estimate accompany every published cell. Unweighted sample sizes are not shown by the tool.
Population	California adults 18 and older (the CHIS adult universe); every respondent is asked the module, so there is no module non-response split. No demographic breakdowns are loaded: AskCHIS publishes them for the seven regions and the state, not for counties.
Measures and buckets	The 8-point scale combines CHIS's eleven ACE questions (which mirror the 2009 to 2020 BRFSS module) into the dashboard's eight categories, so 0 and 4 or more match the dashboard's bands and 1, 2 and 3 are its exact score groups. No demographic buckets are loaded, so none map onto the dashboard's members.
Comparability	A different survey from BRFSS: CHIS interviews by web and telephone from an address-based sample, so levels differ from the dashboard's CDC-derived California values and should not be compared with them or shown as a trend against them. AskCHIS publishes the ACE score groups only; the individual adverse experiences are not published below the state in any public California product, so this state has no counterpart to the per-item measures the dashboard shows elsewhere. CHIS revised its 2021 to 2023 files in October 2026; these exports post-date that revision.
Citation	Source: 2022, 2023, 2024 and 2025 California Health Interview Survey. UCLA Center for Health Policy Research, AskCHIS, extracted 2026-10-27. CHIS asks that AskCHIS data be cited as the California Health Interview Survey with the survey years.

Measures loaded

Measure	Explore counterpart	Periods	Cells
No ACEs (score 0)	Percent of adults with 0 ACEs	2022 to 2023, 2024 to 2025	102
4 or more ACEs	Percent of adults with 4+ ACEs	2022 to 2023, 2024 to 2025	102
Exactly 1 ACE	Explore maps cumulative bands (1 or more, 2 or more, ...), not single scores; the exact group is the difference of two bands and is not offered as a map metric.	2022 to 2023, 2024 to 2025	102
Exactly 2 ACEs	Explore maps cumulative bands (1 or more, 2 or more, ...), not single scores; the exact group is the difference of two bands and is not offered as a map metric.	2022 to 2023, 2024 to 2025	102
Exactly 3 ACEs	Explore maps cumulative bands (1 or more, 2 or more, ...), not single scores; the exact group is the difference of two bands and is not offered as a map metric.	2022 to 2023, 2024 to 2025	102

Reporting areas

Area	Kind	Counties (FIPS)
California	Statewide
Alameda County	County	06001
Alpine County	County	06003
Amador County	County	06005
Butte County	County	06007
Calaveras County	County	06009
Colusa County	County	06011
Contra Costa County	County	06013
Del Norte County	County	06015
El Dorado County	County	06017
Fresno County	County	06019
Glenn County	County	06021
Humboldt County	County	06023
Imperial County	County	06025
Inyo County	County	06027
Kern County	County	06029
Kings County	County	06031
Lake County	County	06033
Lassen County	County	06035
Los Angeles County	County	06037
Madera County	County	06039
Marin County	County	06041
Mariposa County	County	06043
Mendocino County	County	06045
Merced County	County	06047
Modoc County	County