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The cited study: http://www.bjs.gov/content/pub/pdf/rsavcaf9513.pdf It points out that students are very unlikely to report rape to the police, but somehow assumes that they will answer questions about it on a survey. It also shows wide variations from one year to another. It's not a bad study, but the data doesn't really inspire confidence.

Edit: from page 3 "From 1997 to 2013, females ages 18 to 24 consistently experienced higher rates of rape and sexual assault than females in other age brackets."

and from page 4: "However, there was no significant difference in the rates of female students and nonstudents who experienced attempted rape or other sexual assault. This suggests that differences in the rates of completed rape largely accounted for differences in the overall rates of rape and sexual assault between students and nonstudents."