I was never molested in school...but I was kinda of homely.
I was never "molested" as such, either, as I was a homely child, but years later I realised that what a vice-principal of my primary (aka "grade") school put me through when I couldn't have been more than eleven (I won't write the details as to this day I find them traumatic to recall) was sexual abuse of a particularly subtle and therefore all the more difficult-to-report kind.
Okay, so I was educated in the Australian state school system - but I'd say the 10% quoted by the article is a gross underestimate.