ASD (n = 17)

ASD+ADHD (n =15)

ADHD (n = 37)

TD (n = 29)

Gender (boys/girls)

16/1

13/2

29/8

20/9

Autism diagnosis

AS

7

10

0

0

HFA

10

5

0

0

ADHD subtype

Combined

0

2

21

0

Inattentive

0

2

11

0

Hyperactive

0

11

5

0

Age

Range

6 - 12

6 - 12

6 - 12

6 - 12

Mean, SD

7.35 (2.09)

7.87 (1.55)

9.19 (1.68)

9.14 (1.94)

ASD < ADHD**

ASD < TD*

FSIQ (mean, SD)

94.41 (21.19)

99.93 (17.34)

111.11 (17.72)

124.90 (11.11)

ASD < ADHD**

ASD < TD***

ASD + ADHD < TD***

ADHD < TD**

VIQ (mean, SD)

97.82 (22.93)

104.60 (17.02)

120.89 (17.51)

135.00 (10.64)

ASD < ADHD***

ASD < TD***

ASD + ADHD < ADHD* ASD + ADHD < TD***

ADHD < TD**

PIQ (mean, SD)

92.00 (17.44)

94.73 (16.85)

98.14 (17.69)

109.00 (12.59)

ASD < TD**

ASD + ADHD < TD*

ADHD < TD*