"Emotional disturbance" means a condition exhibiting one or more of the following characteristics over a long period of time and to a marked degree that adversely affects a child's educational performance:

An inability to learn that cannot be explained by intellectual, sensory or health factors;
An inability to build or maintain satisfactory interpersonal relationships with peers and teachers;
Inappropriate types of behavior or feelings under normal circumstances;
A general pervasive mood of unhappiness or depression; or
A tendency to develop physical symptoms or fears associated with personal or school problems. The term includes schizophrenia. The term does not apply to children who are socially maladjusted, unless it is determined that they have an emotional disturbance (ED).

14 Categories of Disabilities