Table 4.

Social Responsiveness Scale total raw score means of the ASD, non-ASD, and TD groups

				ASD subcategory
	ASD	nonASD	TD	Autism	Asperger's disorder	PDD-NOS	Unspecified
N (Male/Female)	257 (203 : 54)	157 (78 : 79)	61 (30: 31)	96 (77 : 19)	65 (48 : 17)	68 (54 : 14)	28 (24 : 4)
Age (years)
Mean (SD) Range	10.0 (3.9) 4–18	12.1 (3.7) 4–18	9.61 (2.5) 6–18	9.0 (4.2) 4–18	10.7 (3.1) 4–17	10.0 (4.1) 4–18	11.68 (3.67) 6–17
Intellecual level (N)
Normal	181	118	57	57	64	59	1
Borderline	14	9	4	8	1	3	2
Mild MR	10	12	0	5	0	3	2
Moderate MR	7	3	0	2	0	1	4
Severe MR	12	8	0	2	0	0	10
MR (unknown level)	33	7	0	22	0	2	9
SRS Mean (SD) Range
Males	87.6 (27.4) 15–158†	69.7 (27.9) 13–141†	27.4 (16.6) 6–72†	89.5 (24.0) 48–139‡	82.4 (26.8) 15–132	78.4 (26.5) 24–144‡
Females	86.1 (27.9) 21–153§	62.1 (29.9) 12–134§	21.4 (16.2) 2–65§	91.4 (27.2) 21–133	91.0 (31.4) 38–153	74.7 (25.3) 40–114
Total	87.3 (27.4) 15–158¶	65.9 (29.1) 12–141¶	24.3 (16.5) 2–72¶	89.8 (24.5) 21–139**	84.6 (28.1) 15–153	77.7 (26.1) 24–144**

SRS, Social Responsiveness Scale; ASD, autism spectrum disorders; TD, typical development; PDD-NOS, pervasive developmental disorder not otherwise specified; MR, mental retardation.

^†ASD > non-ASD, TD (t = 4.87, P < 0.001, d = 0.65; t = 11.73, P < 0.001, d = 2.29, respectively), non-ASD > TD (t = 7.79, P < 0.001, d = 1.67).

^‡Autism > PDD-NOS (t = 2.48, P < 0.05, d = 0.44).

^§ASD > non-ASD, TD (t = 4.68, P < 0.001, d = 0.83; t = 11.80, P < 0.001, d = 2.66, respectively), non-ASD > TD (t = 7.17, P < 0.001, d = 1.52).

^¶ASD > non-ASD, TD (t = 7.53, P < 0.001, d = 0.76; t = 17.19, P < 0.001, d = 2.45, respectively), non-ASD > TD (t = 10.51, P < 0.001, d = 1.59).

^**Autism > PDD-NOS (t = 3.05, P < 0.05, d = 0.48).