Although I don't know specifics about PPD, I do know firsthand that Bronxville has a very caring and nurturing student environment and children who are in Special Ed programs become well adjusted as they mainstream into the general student population. I know children there who have been classmates with the special ed students - the Bronxville teachers integrate an education on sensitivity by building awareness about particular needs. This article is an example of the pride shown by the elementary school children actively advocating their awareness.
Bronxville Fifth-Grade Students Make Autistic Students Feel Welcome in School Environment
Building and maintaining social skills is a big part of the town and school community with a lot of beneficial influences like volunteering that cross over from parental involvement and community service.