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National Center for Chronic Disease Prevention and Health Promotion Behavioral Risk Factor Surveillance System BRFSS Home | Contact Us |
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All States | Mean for States | |
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Number of States | 52* | |
Annual | 189,450 | 3648.8 |
Monthly | 15,812 | 304.1 |
* Point-in-Time Excluded.
States with More than One Stratum
Geographic Stratification |
Density Stratification |
All Stratification |
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Number of States | 21 | 50 | 51 |
Number of Strata | 130 | 154 | 284 |
Mean Number of Strata | 6.19 | 3.08 | 5.57 |
All States
Geographic Stratification |
Density Stratification |
All Stratification |
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Number of States | 52 | 52 | 52 |
Total Number of Strata | 16 | 154 | 315 |
Mean Number of Strata | 3.10 | 2.96 | 6.06 |
Types of Sample Designs
Sample Design Type | Number of States | Source of Sample | Number of States |
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Disproportionate Stratified Random | 50 | GENESYS via BSB | 49 |
Waksburg Cluster | 1 | GENESYS purchase by state | 1 |
Simple Random | 1 | Survey Sampling, Inc. | 1 |
Point-in-Time | 1 | Wisconsin Survey Research Lab | 1 |
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Policies and Regulations | BRFSS Home | Contact Us This page last reviewed June 22, 2005
United States Department of Health and Human Services |
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