Indicator: Prevalence of diagnosed diabetes, per 100 adults
Description: Based on the question “Have you ever been told by a doctor that you have diabetes” from the Behavioral Risk Factor Surveillance System (BRFSS), a nationally coordinated, state-based, telephone-administered survey of adults. The cross-sectional health survey provides annual state-level population health estimates for health-related risk behaviors, preventive health practices, and chronic disease and injury.
Data Limitations: Limitations include: 1) relies on self-reported information, 2) provides prevalence, not incidence data, 3) bias or measurement error associated with telephone-administered survey of a sample of the population ( e.g., response bias, sampling variation), 4) designed to provide state-level population health estimates. CDC BRFSS Data Documentation 2016
Indicator Source: 2012 and 2013 use the CDC BRFSS data (using California only). 2014 and 2015 are from the California BRFSS data. This is because in 2014, California BRFSS changed their weighting methodology to match that of the CDC. Versions prior to 2012 of the California BRFSS are not comparable to 2012 and later California BRFSS because of these methodology changes.
Indicator Calculation Methodology: http://www.cdc.gov/brfss/data_documentation/pdf/userguidejune2013.pdf
Data Collection Methodology: http://www.cdc.gov/brfss/data_documentation/index.htm
Program URL Link: http://www.cdc.gov/brfss/data_documentation/index.htm
Geographic Granularity: CDC provides sub-state estimates using small area estimation: http://www.cdc.gov/diabetes/data/county.html
Reporting Cycle: Annually
Reporting Lag: 6-9 Months
Indicator Source Changes: Because of the changes in the methodology, researchers are advised to avoid comparing data collected before the changes (up to 2011) with data collected from 2012 and onward: http://www.cdc.gov/brfss/annual_data/2013/pdf/compare_2013.pdf