Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Read codes for learning disabilities used in this study.
| Read Codes | Definitions |
| E3 | Mental Retardation |
| E30.. | Mild Mental Retardation |
| E310. | Moderate Mental Retardation |
| E311. | Severe Mental Retardation |
| E312. | Profound Mental Retardation |
| E140. | Autism |
| Eu842 | Rett's Syndrome |
| N726./PKy93 | Prader-Willi Syndrome |
| N721/PJ0../PJ0z. | Down 's syndrome |
| N724/PJ2../PJ2z. | Edward's Syndrome |
| PKyz5 | Angelman Syndrome |
| N725/PJyy4 | Fragile X Syndrome |
| C301. | Phenylketonuria |
