Table 2.

Demographic characteristics of 109 children rated by both teacher and parent.

	ASD (n = 57)	Non-ASD (n = 52)
		Neuropsychiatric diagnosis (n = 19)	TD (n = 33)
Boy : girl	41 : 16	12 : 7	20 : 13
Age (years)
Mean (SD), range	8.60 (3.90), 4–17	8.26 (2.77) 5–15	7.67 (2.13) 5–12
Intellectual level (n)
Normal	34	9	33
Borderline	14	5	0
Mild MR	3	4	0
Moderate MR	2	0	0
Severe MR	2	1	0
MR (unknown level)	2	0	0
IQ*	n = 49	n = 19	n = 32
Mean (SD), range	91.2 (26.8), 31–148	82.7 (23.3), 27–113	109.7 (13.8), 85–146

Note. Between the ASD and non-ASD groups, no significant differences existed in gender ratio (χ ² = 0.25, ns) or age (t = 1.2, ns). The proportion of intellectual level did not differ significantly by group (χ ² = 9.4, ns). For 100 children with available IQ data, mean IQ did not significantly differ between groups (91.2 [26.8] for ASD, 99.7 [22.0] for non-ASD). Among the ASD and two non-ASD groups, no significant differences existed in gender ratio (χ² = 0.51, ns) or age (F = 0.84, ns). The proportion of intellectual level differed significantly by group (χ² = 28.5, P < 0.005). *For 100 children with available IQ data, mean IQ of the ASD group (n = 49) and that of the non-ASD neuropsychiatric diagnosis group (n = 19) were lower than that of the TD group (n = 32) (t = 4.1, 4.6, respectively, P values < 0.001), whereas no significant difference existed between the former two groups (t = 1.2, ns). MR: mental retardation; ASD: autism spectrum disorder; TD: typically developing.