According to studies, drivers ranging from 16- to 20-years old with a blood-alcohol level of .02 percent to .049 percent had almost a three times higher risk of being involved in a fatal crash than sober drivers of similar age. Their chances of dying in a single-vehicle crash were almost four times greater. It also showed the risk of a fatal car crash doubled for sober male drivers between 1996 and 2007. The researchers said unfocused driving may well be the cause. The researchers settled that drunk-driving and distracted-driving prevention education is needed for both boys and girls.