Course of DSM-IV symptoms for diagnosis of autistic disorder according to autism diagnosis interview scores
| DSM-IV items | 4–5 y | 13 y |
|---|---|---|
| Social interaction | ||
| Failure to use non-verbal behaviours to regulate social interaction (/6) | 3 | 2 |
| Failure to develop peer relationships (/10) | 6 | 3 |
| Lack of shared enjoyment (/6) | 4 | 1 |
| Lack of socioemotional reciprocity (/10) | 5 | 3 |
| Total (cut off=10)1-150 | 18 | 9 |
| Communication | ||
| Delay in spoken language and failure to compensate through gesture (/8) | 4 | 3 |
| Lack of varied spontaneous make believe or social imitative play (/6) | 6 | 4 |
| Relative failure to initiate or sustain conversational interchange (/4) | 2 | 3 |
| Stereotyped, repetitive, or idiosyncratic speech (/8) | 1 | 3 |
| Total (cut off=8) | 13 | 13 |
| Repetitive behaviours and stereotyped patterns | ||
| Encompassing preoccupation or circumscribed pattern of interest (/4) | 4 | 4 |
| Compulsive adherences to non-functional routines or rituals (/4) | 2 | 2 |
| Stereotyped and repetitive motor mannerisms (/2) | 1 | 1 |
| Preoccupation with parts of objects (/2) | 2 | 2 |
| Total (cut off=3) | 9 | 9 |
↵1-150 Value above which an area is considered sufficiently impaired for the diagnosis of autism.