Groupings of the ADI-R RRB items
| RRB category | ADI-R item |
|---|---|
| Object interests | 69. Repetitive use of objects or interest in parts of objects |
| Resistance to change | 70. Compulsions/rituals |
| 74. Difficulties with minor changes in own routines or personal environment | |
| 75. Resistance to trivial changes in environment | |
| Restricted interest | 67. Unusual preoccupations |
| 68. Circumscribed interests | |
| 76. Unusual attachment Sensory interests | |
| Sensitivity to noise | 71. Unusual sensory interests |
| 72. Sensory aversions | |
| Body movements | 77. Hand or finger mannerisms |
| 78. Other complex mannerisms or stereotyped body movements | |
| 79. Complex mannerisms | |
| Verbal | 33. Stereotyped utterances and delayed echolalia |
| 39. Verbal rituals |
Only a subset of the children was analyzed for the verbal RRB category. RRB, restricted and repetitive behavior; ADI-R, Autism Diagnostic Interview-Revised