Actually, I am highly suspicious of anything the CDC decrees. They are historically famous for inflating all sorts of ills - especially those relating to guns, wife beating, guns in the home and childrens’ susceptibility ad nauseum.
It would not surprise me one doggone bit they included a high occurrence of the perceived problem in ‘white’ children just to give the ‘study’ a modicum of credibility.
I hear Somali, and I automatically move to thinking Islam. I cannot be moved from that assumption. In the end, I believe that will be the reason for any out-of-norm finding.