Table 1 Participant demographics

Gripping (Force test)

 N

74 (20 F)

76 (11 F)

41 (10 F)

33 (6 F)

33 (10 F)

43 (5 F)

 Age

13.8 (6.9)

12.2 (5.3)

14.3 (6.0)

14.6 (5.7)

13.0 (7.9)

10.3 (4.0)

 Handedness (R/L)

66/5

61/14

39/2

30/3

30/3

32/11

 Verbal IQ

111 (16)

96 (18)*

110 (19)

99 (19)

113 (10)

92 (15)

 Nonverbal IQ

107 (15)

100 (18)*

105 (14)

99 (18)

108 (15)

100 (17)

 ADOS CSS

–

7.05 (1.87)

–

6.80 (2.00)

–

7.26 (1.75)

Gripping (Gain test)

 N

59 (14 F)

45 (7 F)

40 (10 F)

33 (6 F)

19 (5 F)

12 (2 F)

 Age

13.0 (6.6)

13.2 (5.7)

14.7 (6.1)

14.8 (5.7)

9.9 (6.5)

9.1 (3.3)

 Handedness (R/L)

50/5

37/6

37/3

30/3

16/3

9/3

 Verbal IQ

111 (17)

98 (19)*

110 (19)

100 (20)

113 (12)

86 (14)

 Nonverbal IQ

106 (16)

100 (19)

105 (15)

100 (18)

107 (19)

101 (23)

 ADOS CSS

–

6.81 (1.85)

–

6.65 (2.02)

–

7.25 (1.21)

Eye movement (VGS test)

 N

82 (19 F)

88 (14 F)

55 (13 F)

61 (12 F)

27 (7 F)

27 (3 F)

 Age

14.8 (6.8)

12.8 (5.1)*

14.9 (6.3)

13.6 (5.2)

14.5 (7.8)

11.1 (4.2)

 Handedness (R/L)

75/4

74/12

50/3

56/4

25/1

18/8

 Verbal IQ

110 (13)

97 (18)*

109 (16)

99 (18)

114 (11)

92 (18)

 Nonverbal IQ

106 (13.5)

101 (18)*

104 (12.6)

101 (18)

110 (15)

100 (19)

 ADOS CSS

–

6.88 (2.09)

–

6.84 (2.21)

–

7.00 (1.78)

Grip + VGS tests

 N

45 (13 F)

48 (9 F)

25 (6 F)

25 (6 F)

20 (7 F)

23 (3 F)

 Age

15.0 (6.9)

13.3 (5.3)

15.5 (6.1)

15.0 (5.6)

14.5 (7.8)

11.3 (4.1)