Weighting Methodology

Select the desired range of years.

Only one selection is permitted.

NOTE: In 2011, cell phone interviews were included in the BRFSS survey and a new weighting methodology called iterative proportional fitting, or "raking" was implemented. Prior to 2011, survey results were obtained through landline interviews only and weighted by post-stratification. It is recommended that estimates prior to 2011 not be compared to estimates from 2011 to present.