Conclusion(Preliminary) Conclusion: 4 of the 5 claims check out so far (with caveats based on imperfect data sets), based on referenced crime data provided by the DOJ and FBI. (Still working on the final claim)
Nitpick: The "Rape/sexual assault" crime category in the DOJ reports is fairly broad (it includes attempted rape, other kinds of sexual assault, and even threats of rape), and it is not possible, withso this data, to distinguishparticular source doesn't differentiate between the reporting percentage of each of these smaller sub-groups (if there is any difference).
I found another (earlier) source that does distinguish between them, and the numbers aren't out of line. The BJS report "Rape and Sexual Assault: Reporting to Police and Medical Attention, 1992-2000" reports the following in Table 3:
- Completed Rape: 36% reported to police
- Attempted Rape: 34% reported to police
- Sexual assault: 26% reported to police
31% still seems like a reasonable number.