| APMR | Association for Physical and Mental Retardation |
|---|---|
| ARNMD | Association for Research in Nervous and Mental Diseases |
| ATR | Achilles tendon reflex; alpha-thalassemia-mental retardation [syndrome] |
| ATRX, ATR-X | X-linked alpha-thalassemia mental retardation [syndrome] |
| BGMR | basal ganglion disorder with mental retardation |