Table 1.

Demographic and clinical characteristics

	ASD	ADHD	Control	ANOVA		Post hoc
Mean ± SD	(n = 23)	(n = 32)	(n = 29)	F value	P‐value	analysisa
Age (range: 17.5–30 y/o)	21.396 ± 3.05	23.359 ± 3.348	22.424 ± 3.328	2.44	0.094
Right‐handed (%)	21 (91.3%)	30 (93.8%)	29 (100%)	2.391b	0.303
Intelligence quotient (IQ)
Verbal IQ	98.27 ± 21.54	108 ± 10.05	113.93 ± 9.61	7.97	<0.001	ASD< ADHD, Control
Performance IQ	97.27 ± 23.97	110.5 ± 13.32	112.93 ± 12.6	6.24	0.003	ASD< ADHD, Control
Full‐scale IQ	97.82 ± 22.51	109.69 ± 10.58	114.59 ± 11.06	8.27	<0.001	ASD< ADHD, Control
(Range of Full‐scale IQ)	45–130	87–137	86–134
The adult autism spectrum quotient
Socialness	38.33 ± 5.59	—	24.93 ± 8.52	32.54	<0.001
Mindreading	23.29 ± 4.98	—	14.60 ± 1.84	41.27	<0.001
Patterns	12.24 ± 4.00	—	9.80 ± 2.26	4.52	0.041
Attention to details	11.00 ± 1.95	—	9.73 ± 1.67	4.15	0.049
Attention switching	17.33 ± 3.31	—	14.07 ± 3.20	8.78	0.006
Total score	102.19 ± 12.74	—	73.15 ± 7.83		<0.001
Adult ADHD Self‐Report Scale
Inattention	—	26.44 ± 4.74	12.12 ± 3.61	136.63	<0.001
Hyperactivity/Impulsivity	—	20.72 ± 5.33	7.97 ± 4.66	77.29	<0.001
Head motionc (signal dropout count)	40.30 ± 18.07	24.34 ± 17.56	32.83 ± 21.55	4.73	0.012	ASD> ADHD

^aPairwise comparison by post hoc analysis with Scheffé Test.

^bChi‐square test.

^cHigh signal dropout count imply more head motion.