Onset of a declining trend in fatal motor vehicle crashes involving drunk-driving in Japan.

The proportion of those untested showed a decreasing trend of −0.34% per month (95% CI, −0.46 to −0.23) with no change-point, and the proportion of those with no information on alcohol consumption showed no significant trend until a change-point of April 2002 (95% CI, May 1998 to May 2003), turning to a decreasing trend of −1.41% (95% CI, −2.00 to −0.81) (data not shown in figure).

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We assumed these factors were likely to evenly affect all fatal crashes (eg, increased traffic volume along with booming economies, indicating increased exposure to risk of crash, would similarly contribute to an increasing trend in both alcohol-related and non–alcohol-related fatal crashes).

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