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Interpretation of Incidence Rates Data

Incidence Rate Report for California by County

Breast (All Stages^), 2018-2022

All Races (includes Hispanic), Female, All Ages

Sorted by Recentaapc

Explanation of Column Headers
Incidence Rate (95% Confidence Interval) - The incidence rate is based upon 100,000 people and is an annual rate (or average annual rate) based on the time period indicated. Rates are age-adjusted by 5-year age groups to the 2000 U.S. standard million population.

Recent Trends - This is an interpretation of the AAPC/APC:

AAPC/APC (95% Confidence Interval) - the change in rate over time


Other Notes


Line by Line Interpretation of the Report


California7


US (SEER+NPCR)1


Lassen County7


Modoc County7


Del Norte County7


Trinity County7


Yuba County7


Amador County7


Mendocino County7


Tehama County7


Nevada County7


Madera County7


Kern County7


Mariposa County7


Imperial County7


Mono County7


Plumas County7


Butte County7


Glenn County7


San Benito County7


Merced County7


Placer County7


Riverside County7


San Diego County7


San Joaquin County7


Yolo County7


Kings County7


Sacramento County7


Sutter County7


Tulare County7


Siskiyou County7


San Bernardino County7


Stanislaus County7


Inyo County7


Santa Barbara County7


Shasta County7


Solano County7


Ventura County7


Fresno County7


Humboldt County7


Monterey County7


Orange County7


Los Angeles County7


San Luis Obispo County7


San Mateo County7


Colusa County7


Napa County7


Marin County7


Santa Clara County7


Santa Cruz County7


Alameda County7


Lake County7


Contra Costa County7


Sonoma County7


El Dorado County7


Tuolumne County7


San Francisco County7


Calaveras County7


Alpine County7 Sierra County7


Notes:
Created by statecancerprofiles.cancer.gov on 03/13/2026 11:54 pm.

State Cancer Registries may provide more current or more local data.

Trend
Rising when 95% confidence interval of average annual percent change is above 0.
Stable when 95% confidence interval of average annual percent change includes 0.
Falling when 95% confidence interval of average annual percent change is below 0.


† Incidence rates (cases per 100,000 population per year) are age-adjusted to the 2000 US standard population (SEER areas use 20 age groups and NPCR areas use 19 age groups). Rates are for invasive cancer only (except for bladder cancer which is invasive and in situ) or unless otherwise specified. Rates calculated using SEER*Stat. Population counts for denominators are based on Census populations as modified by NCI. The US Population Data File is used for SEER and NPCR incidence rates.

‡ Incidence data come from different sources. The Average Annual Percent Change (AAPC) is based on the APCs calculated by Joinpoint. Due to data availability issues, the time period used in the calculation of the joinpoint regression model may differ for selected counties.

Rates and trends are computed using different standards for malignancy. For more information see malignant.html.

^ All Stages refers to any stage. Due to changes in stage coding, Combined Summary Stage with Expanded Regional Codes (2004+) is used for data from Surveillance, Epidemiology, and End Results (SEER) databases and Merged Summary Stage is used for data from National Program of Cancer Registries databases. Due to the increased complexity with staging, other staging variables maybe used if necessary.

⋔ Results presented with the CI*Rank statistics help show the usefulness of ranks. For example, ranks for relatively rare diseases or less populated areas may be essentially meaningless because of their large variability, but ranks for more common diseases in densely populated regions can be very useful. The rates used in CI*Rank are all age-adjusted to the 2000 US standard population using 19 age groups for SEER and NPCR areas. More information about methodology can be found on the CI*Rank website.

Φ Rural–urban county classifications are based on the 2023 USDA Rural–Urban Continuum Codes (except for Connecticut Counties which use 2013 codes). State-level cancer rates for rural areas are calculated using cancer cases registered exclusively in rural counties, while state-level cancer rates for urban areas are calculated using cases registered exclusively in urban counties.

1 Source: National Program of Cancer Registries and Surveillance, Epidemiology, and End Results SEER*Stat Database - United States Department of Health and Human Services, Centers for Disease Control and Prevention and National Cancer Institute. Based on the 2024 submission.

7 Source: SEER November 2024 submission.

* Data has been suppressed to ensure confidentiality and stability of rate estimates. Counts are suppressed if fewer than 16 records were reported in a specific area-sex-race category.

Data for United States does not include Puerto Rico.