Why not read some things on the other side
RAD is a very uncommon diagnosis.
http://www.childrenintherapy.org/attachmentdisorder.html
The profession has not caught up with the realities of the oligarchy engineered destruction of fathers, fathering and the family.
My housemate actually believes that the frequency of significant degrees of RAD is even higher than 80%. He believes it's closer to 95%.
He arrived at those figures from the 3,000+ students he's taught on 2 continents. With classes of 35-75 students, probably at least 50% of those classes did not have ONE student who seemed to be relatively free of significant RAD. In the rest of those classes, probably 90+% of the other 50% of those classes had only one or two students who were relatively free of significant RAD. Maybe a total of approximately 5 of those classes may have had no more than 3 students who were relatively free of significant RAD.
Suffice it to say, we are quite comfortable with the accuracy of our estimates of the incidence of significant RAD. If anything, the younger the cohort, the more RAD.
When we say "significant RAD," we mean sufficient amounts of it to cause significant, obvious, chronic problems in virtually all their relationships and in their expression of emotions.