Table 2.

Internal consistency of the ADBB scale in the first evaluation.

Items	Mean	SD	Corrected item-total correlation	Cronbach's alpha if item deleted
1. Facial expression	0.39	0.63	0.697	0.774
2. Eye contact	0.21	0.51	0.548	0.798
3. General level of activity	0.16	0.39	0.425	0.814
4. Self-stimulating gestures	0.17	0.49	0.388	0.817
5. Vocalizations	0.45	0.68	0.428	0.819
6. Response to stimulation	0.28	0.51	0.569	0.795
7. Relationship	0.33	0.58	0.590	0.791
8. Attraction	0.39	0.65	0.695	0.774