A substantial contrast exists between the 32.3 percent of students who had driven under the influence and the 1.5 percent who had been arrested for drunk driving. Alcohol Use and Academic Performance Table 4.9 describes the relationship between the average number of drinks consumed per week and grade average. As can be seen, the heaviest drinkers obtained the lowest grades. For many of the substances listed, use by graduate students is lower than use by undergraduates. Among undergraduates, upperclassmen show lower figures for tobacco and inhalants, and higher figures for alcohol and cocaine.
Seniors demonstrate less use of amphetamines and hallucinogens than other undergraduates.
Alcohol and Other Drugs Table 4.11 examines thirty-day prevalence rates for alcohol and other drugs by students' year in school. For many of the substances listed, use by graduate students is lower than that of undergraduates. With the other drugs listed, the pattern is less clear. As the table shows, there is relatively little variation among the undergraduate classes. However, considerably fewer graduate students reported episodes of binge drinking, as compared with the undergraduate classes.