Drivers younger than 18 years are not included in the BRFSS, a potential limitation of the report. The survey was conducted only via land-line telephones and exclusion of responses via cell phones is another potential limitation. In addition, "significant underreporting" is likely because the alcohol-impaired driving rates are based on self-reports, Dr. Frieden said.
Dr. Frieden and Dr. Bergen said that they had no relevant financial disclosures.