http://www.pediatricsdigest.mobi/content/114/4/1028.fullAmong the 10 904 respondents, 64% were female, 74% were white, and 89% were 18 to 24 years of age. By comparison, among full-time undergraduates at the 119 participating schools, 53% were female and 70% were white. In a national sample of US undergraduates, 54% were female, 73% were white, and 89% were aged 18 to 24 years.