2.8% of a sample of 14,657 (approximately 410) college students surveyed in 1997 reported having used ecstasy at least once in the 12 months prior to survey, and 4.73% of 13,958 college students (approximately 660) reported having used ecstasy in the 12 months prior to survey, with respondents sampled from 119 US colleges and universities. This statistically significant increase in ecstasy use was seen in both genders, in all years in school and in both members and non-members of fraternities and sororities. There was no significant increase in ecstasy use over time for non-white students, for students over age 24 or for married students, and the increase in ecstasy use was most pronounced in students residing in dormitories and sophomores. 10.6% of approximately 6750 undergraduates surveyed in 2000 (approximately 716) reported having used ecstasy in the year prior to survey, but these students all attended schools selected on the basis of their having binge drinking problems on campus. Reporting ecstasy use was most strongly correlated with marijuana use, but it was also correlated with other self-reported risky behaviors (binge drinking, multiple sexual partners). Ecstasy use was also associated with rating the arts and parties as important, and rating religion and studying as less important. However ecstasy users and non-users did not differ on grade point average.