Table 2 Items used, their descriptions and the Student’s t-test statistic.

ADI_35

Current:reciprocal conversation

9.2263

ADI_34

Current:social vocalization/chat

7.1570

ADI_68

Current:circumscribed interests

6.5214

ADI_51

Current:social smiling

6.3941

ADI_33

Current:stereotyped utterances and delayed ech...

6.3521

ADI_42

Current:pointing to express interest

6.2030

ADI_59

Current:appropriateness of social responses

6.1215

ADI_45

Current:conventional/instrumental gestures

5.7257

ADI_57

Current:range of facial expression used to com...

4.9405

ADI_72

Current:undue general sensitivity to noise

4.7258