This is not a surprise to me, because abuse and sexual abuse, are very high. So it makes sense to me, they also cause the most PTSD.
What may be surprising to many, is that combat is one of the least traumas causing PTSD.
I reference all my work, as is noted on my Website, and I like to clearly reference and link the work, to the original work.
These stats are from http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0021864