Table 1.

Demographic information.

	Non-autistic participants			Autistic participants
	Range	M	SD	Range	M	SD	p value
Age	12.1–16.9	14.4	1.4	12.5–16.9	14.8	1.0	0.21
IQ	80–135	111	12	80–132.5	107.5	12.6	0.24
AQ	2–22	8.4	5.0	3–22	12.9	4.7	<0.001 a
DIF	7–17	10.5	2.5	7–17	11.8	2.9	0.03 a
DDF	5–15	9.0	2.9	5–15	10.0	2.5	0.14
Motion during scan	0.05–0.26	0.099	0.048	0.05–0.18	0.080	0.027	0.046 a
		n	%		n	%
Medication use		0	100		15	42.9
Methylphenidate					12	34.3
Antipsychotics					4	11.4
Other					5	14.3
Comorbidities		0	100		20	57.1
Dyslexia					9	25.7
ADHD					8	22.9
PTSD					2	5.7
Sensory integration disorder					2	5.7
Other					4	11.4
Ethnicity
The Netherlands		31	91.2		33	94.3
Western Europe		0	0		1	2.9
South Africa		1	2.9		1	2.9
USA		1	2.9
Southeast Asia		1	2.9
Gross annual income
<€31.000–		2	5.9		3	8.6
€31.000–€76.000		18	53		16	45.7
>€76.000–		13	38.2		10	28.6
Declined to disclose		1	2.9		6	17.1

IQ: estimated based on 2 WISC/WAIS-III subtests: block patterns and similarities; AQ: autism quotient questionnaire measuring autism traits; DIF: alexithymia difficulty identifying feelings; DDF: alexithymia difficulty describing feelings; SD: standard deviation; ADHD: attention-deficit/hyperactivity disorder; PTSD: post traumatic stress disorder.

^aIndependent samples t test indicates significant difference between groups.