Table 4.

The first 20 items of the Vineland socialization domain and median age by which skill is acquired according to the standardization data (Sparrow et al. 1984)

Item #	Vineland socialization domain item	Age of acquisition in years-months
1	Looks at face of caregiver	<0–2
2	Responds to voice of caregiver or another person	<0–2
3	Distinguishes caregiver from others	<0–2
4	Shows interest in novel objects or new people	<0–2
5	Expresses two or more recognizable emotions such as pleasure, sadness, fear or distress	<0–2
6	Shows anticipation of being picked up by caregiver	<0–2
7	Shows affection toward familiar people	0–4
8	Shows interest in children or peers other than siblings	0–4
9	Reaches for familiar person	0–5
10	Plays with toy or other object alone or with others	0–5
11	Plays very simple interaction games with others	0–6
12	Uses common household objects for play	0–7
13	Shows interest in activities of others	0–8
14	Imitates simple adult movements, such as clapping hands or waving good bye, in response to a model	0–7
15	Laughs or smiles appropriately in response to positive statements	0–11
16	Addresses at least two familiar people by name	0–11
17	Shows desire to please caregiver	1–3
18	Participates in at least one game or activity with others	1–7
19	Imitates a relatively complex task several hours after it was performed by another	1–6
20	Imitates adult phrases heard on previous occasions	1–11