WASHINGTON — A report finds that about 20 percent of campus sexual assault victims ever go to police.

That's according to the Justice Department.

About one in 10 say they don't think it's important enough to warrant police attention. They also view it as a personal matter or say they don't think authorities would or could help. Or they fear reprisal if they report it.

Rape happens more to young women between the ages of 18 and 24 than to any other age group. Also, the report finds that women not in school had higher rates of victimization than those in school.

Researchers from the department's Bureau of Justice Statistics used 1995 to 2013 figures from the National Crime Victimization Survey.