Using the data from the 2015-2016 school year, the National Center for Learning Disabilities released an infographic depicting some of the quantitative data they had collected over the year.
In this infographic, they provide numbers about children with learning and attention deficit issues. To supplement these numbers, they also list out detailed approaches to some possible hurdles when teaching these children.
Take a look at it here:
https://www.ncld.org/wp-content/uploads/2017/03/1-in-5-Snapshot.Fin_.03142017.pdf