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Technological and cultural changes are posing significant challenges to telephone survey research. One of the most significant challenges of the past decade has been the rapid increase in households in which telephone service is primarily or only by cell phones.
Starting with reporting of our 2011 data, the BRFS became a multi-mode survey to obtain a more representative sample of Delaware's adult population. Up to 70 percent of interviews are on cell phones, but we maintain a small landline phone sample. The BRFS is now also using a new method for weighting data that more accurately reflects the actual population of each state.
Trend lines for many data points were broken in 2011, and 2011 data became the new baseline for analyses. The result has been improved scientific validity of BRFS data. These and future improvements will ensure that the BRFSS continues to be the leading source of essential behavioral data for public health planning, program development, education, and evaluation.