Patterns of self-reported drinking and driving in Michigan.

We analyzed a statewide telephone survey of Michigan adults to determine patterns of self-reported drinking and driving. The estimated prevalence of drinking and driving was 13.5 percent for men and 2.9 percent for women; the highest prevalence was among 18- to 24-year-old men (32 percent). Based on these estimates, over half a million Michigan adults drank and drove on over one million occasions during the month preceding the survey. Most drinking drivers (93 percent) reported binge drinking, yet 70 percent of them otherwise reported only moderate routine alcohol consumption, that is, they consumed fewer than 14 drinks a week on average. Because we were concerned about the validity of self-reports, we compared the patterns of self-reported alcohol use with the patterns of alcohol-related motor vehicle crashes. The pattern of self-reported drinking and driving (using age-, sex-, and region-specific estimates) was highly correlated with the pattern of injury in alcohol-related crashes (r = .96; p less than .0001). Self-reported patterns of alcohol use may be used to identify persons at highest risk for being injured or dying in a motor vehicle crash.