The research, published in the September issue of the Journal of Studies on Alcohol and Drugs, found that at 18 heavy-drinking U.S. campuses, students’ alcohol habits showed little change over a dozen years. In 1993, 58 percent of students reported binge drinking in the past two weeks; in 2005, 56 percent said the same. And although 28 percent of students in 1993 said they frequently binged, that figure was 32 percent in 2005.