1) Researchers studied nearly 200,000 children, ages birth through 17, from 2000 to 2011 and found that, overall, disabilities affected 8% of them by 2011–10% of low-income children and 6% of wealthy children.

2) According to the U.S. Government Accountability Office, nationally 8% of charter school students have a disability vs 11% in district-run schools. However, a CER survey found that 13.6% of charter students and 12.9% of district-run school students have disabilities.

3) Between 1970 and 2012, the number of school employees increased by 84%, and non-teaching staff members rose by 130% to more than 3 million–or about 50% of public school districts’ overall staffs.

4) A Vanderbilt University study found that 84% of principals view teacher observations as “valid to a large extent.”

5) According to OCED’s “Education at a Glance 2014,” the U.S. has the 5th largest proportion of adults, 25 to 64, with a college degree.