| Characteristics | N | % |
| Gender | ||
| Females | 294 | 50.2 |
| Males | 292 | 49.8 |
| Age | ||
| 6 | 5.6 | |
| 7 | 6.3 | |
| 8 | 6.5 | |
| 9 | 5.5 | |
| 10 | 9.2 | |
| 11 | 8.5 | |
| 12 | 8.7 | |
| 13 | 9.9 | |
| 14 | 11.8 | |
| 15 | 15.5 | |
| 16 | 12.5 | |
| Diagnosis | ||
| “Without IDD” | 318 | 54.3 |
| IDD mild1 | 45 | 7.7 |
| IDD moderate | 122 | 20.8 |
| IDD severe | 47 | 8.0 |
| Multiple disabilities | 54 | 9.2 |
| Setting | ||
| Institutional Setting | 268 | 45.7% |
| Mainstreaming settings | 318 | 54.3% |