Table 1.

Demographic characteristics.

	ADHD (n = 30)			Healthy Comparison (n = 15)	z, P
	Sports-ADHD (n = 13)		Edu-ADHD (n = 17)
Age		15.9 ± 1.2		16.0 ± 1.9	0.31, 0.76
	15.8 ± 1.7		16.0 ± 1.2		0.45, 0.65
School year		8.7 ± 1.3		8.9 ± 1.9	0.25, 0.97
	8.6 ± 1.4		8.8 ± 1.2		0.56, 0.58
K-ARS		25.8 ± 7.5		4.07 ± 3.9	5.3, <0.01*
	25.3 ± 8.1		26.1 ± 7.3		0.63, 0.53
MTX (mg d−1)	26.9 ± 9.5		26.5 ± 10.0	—	0.11, 0.91
WCST
TCC		46.0 ± 26.4		33.6 ± 19.3	1.94. 0.06
	45.8 ± 25.8		46.3 ± 28.2		0.06, 0.94
Total errors		22.4 ± 12.3		17.6 ± 9.4	1.23, 0.21
	20.7 ± 10.7		24.6 ± 14.3		0.48, 0.63
Perseverative responses		21.0 ± 9.2		12.5 ± 5.2	2.95, <0.01*
	21.2 ± 8.2		20.8 ± 10.7		0.21, 0.83
Perseverative errors		13.3 ± 5.6		8.1 ± 3.1	3.29, <0.01*
	14.2 ± 6.4		12.6 ± 4.9		0.69, 0.49
NPE		4.7 ± 3.7		4.3 ± 3.5	0.29, 0.77
	5.4 ± 4.8		4.2 ± 2.7		0.27, 0.78
IQ		95.4 ± 13.2		104.3 ± 10.5	2.08, 0.03*
	94.9 ± 11.8		95.9 ± 15.2		0.10, 0.91

WCST was performed before brain imaging.

^*The value is statistically significant.

K-ARS, Dupaul attention deficit hyperactivity disorder rating scale–Korean version; MTX, stabilized methylphenidate dosage; NPE, nonperseverative errors; TCC, total trials to complete categories.