Childhood trauma and adult psychiatric illness in identical twins.

Link. ” …. those who reported one or more trauma in childhood — physical or emotional neglect or abuse, rape, sexual abuse, hate crimes or witnessing domestic violence — were 2.4 times as likely to be diagnosed with a psychiatric illness as those who did not…

… 52 percent [risk increase] for each additional adverse experience.”

I would have bet the effect would be far smaller. This is mind boggling.