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Nonverbal communication (NVC) score quantified by seven ADI-R items
| Lack of, or delay in, spoken language and failure to compensate through gesture |
| 1. Pointing to express interest |
| 2. Conventional instrumental gestures |
| 3. Nodding |
| 4. Headshaking |
| Lack of varied spontaneous make-believe or social imitative play |
| 5. Spontaneous imitation of actions |
| 6. Imaginative play |
| 7. Imitative social play |
