If it is only one or two incidents per person, and only 20% of women experience it, I don't think it is very surprising that you wouldn't see it.
Just amazing that to me something that would seem totally out of place at work or seem "crazy" to have happen... a lot of people experience in the same workplaces I'm in.
The 'event' is more than the time it takes to happen, it colors the rest of your interactions with a company. (Do the other people know? do they condone? Who is safe? if the initial event was minor, will that person escalate?)
exhausting.