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A new study of more than 1,200 students who answered questions throughout four years at a mid-Atlantic university found that among those at age 20, 20 percent drove while intoxicated, and that 43 percent had been passengers in a car driven by someone who was intoxicated. The odds for either behavior were greater for male students, and went up at age 21. The latter finding, the paper says, could be an argument against the move to lower the drinking age. The study was conducted by Amelia M. Arria, director of the Center on Young Adult Health and Development at the University of Maryland School of Public Health, and results will appear in Alcoholism: Clinical & Experimental Research.