These are the definitions used by experts in the U.S. and internationally. The Texas Department of Aging and Disability Services follows the standards in the DSM.
Sources:
1. United Nations/ World Health Organization/ International Statistical Classification of Diseases and Related Health Problems/ 10th Revision/ 2007 (WHO)
2. American Psychiatric Association/ Diagnostic and Statistical Manual of Mental Disorders, 4th Edition (DSM-IV)

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Detailed charts on demographics of state school residents
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or click on the desired graph for an individual PDF of that data.

Levels for developmental disability of residents, by facility

Levels of deficit in adaptive behavior of residents, by facility

Residents who are medically fragile, by facility

Moderate Health Needs – The individual has chronic health problems (e.g. uncontrolled seizures, heart ailment) which requires professional intervention (more than just medication administration), but less than daily.
Severe Health Needs - The individual's health status is unstable or there are serious multiple health problems which may be life threatening, requiring professional intervention on a daily basis.

Residents with dual diagnosis, by facility

Notes on the data:
All demographic data presented here is public information and was received from DADS via an Open Records request in October, 2007. The definitions use by the World Health Organization and the American Psychiatric Association are from their respective web sites:
World Health Organization
American Psychiatric Association - Diagnostic and Statistal Manual of Mental Disorders