Driver- and passenger-based estimates of alcohol-impaired driving in the U.S., 2001-2003

Abstract

Background: Alcohol-impaired driving (AID) continues to be a major public health problem in the U.S. The objective of this study was to estimate the number of annual driver- and passenger-reported episodes of AID and explore the effect of sociodemographic characteristics and drinking patterns on both behaviors.

Methods: Data from a nationally representative random-digit-dial telephone survey of U.S. adults were analyzed in 2007.

Results: From July 23, 2001, to February 7, 2003, an estimated 7 million drivers reported 190 million annual episodes of AID, and an estimated 10.5 million passengers reported 290 million annual episodes of AID. A comparison of estimates from this survey to those from a similar survey conducted in 1994 shows that episodes of both driver- and passenger-reported AID have increased by slightly more than 50%. Multivariable analysis revealed several gender differences in risk factors for both driver- and passenger-reported AID. For example, being of Hispanic ethnicity and not always wearing a seat belt were both associated with an increased risk of AID episodes for men but not women. A strong association between binge drinking and both driver- and passenger-reported AID was found for both genders.

Conclusions: Episodes of driver- and passenger-reported AID increased substantially between the middle 1990s and the early 2000s. The passenger estimates suggest that drivers may under-report AID by about 50%. Public health interventions to reduce AID should give equal consideration to impaired drivers and their passengers.