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Table 1 Comparisons of demographic characteristics, ASSQ and SNAP-IV scores of the different groups

From: Specific brain imaging alterations underlying autistic traits in children with attention-deficit/hyperactivity disorder

 

ADHD (N = 172)

HC − ATs1 (N = 44)

t/F/χ2 a

Pa

ADHD − ATs2 (N = 105)

ADHD + ATs3 (N = 67)

F/χ2 b

Pb

Pairwise comparison c

Age in years (mean ± SD)

8.84 ± 1.71

9.51 ± 1.16

3.07

0.0027

8.89 ± 1.70

8.75 ± 1.75

3.18

0.0436

1 > 2 = 3

Male [n, (%)]

146 (84.89)

33 (75.00)

2.41

0.1205

88 (83.81)

58 (86.57)

2.63

0.2684

FSIQ (mean ± SD)

93.33 ± 10.36

106.34 ± 9.52

7.56

1.200E−12

94.24 ± 9.43

91.90 ± 11.60

29.78

3.929E−12

1 > 2 = 3

ADHD subtypes [n, (%)]

 ADHD-IA

72 (41.86)

50 (47.62)

22 (32.84)

0.1209

 ADHD-HI

7 (4.07)

3 (2.86)

4 (5.97)

   

 ADHD-C

93 (54.07)

52 (49.52)

41 (61.19)

   

ASSQ (mean ± SD)

 Total score

10.41 ± 8.11

3.03 ± 2.74

10.50

0.0014

5.09 ± 3.67

18.76 ± 5.78

235.16

2.499E−54

1 = 2 < 3

 Social interaction

3.99 ± 3.33

0.95 ± 1.06

13.21

0.0004

1.97 ± 1.77

7.16 ± 2.67

152.00

1.522E−41

1 = 2 < 3

 Communication problems

2.76 ± 2.54

1.23 ± 1.60

1.61

0.2066

1.37 ± 1.39

4.94 ± 2.39

81.74

5.549E−27

1 = 2 < 3

RRBs

3.66 ± 3.28

0.84 ± 1.01

10.46

0.0014

1.74 ± 1.75

6.66 ± 2.83

129.36

2.433E−37

1 = 2 < 3

SNAP-IV (mean ± SD)

 Total score

30.40 ± 9.63

17.98 ± 10.85

39.05

2.247E−9

29.14 ± 10.09

32.36 ± 8.55

21.88

2.338E−9

1 < 2 < 3

 Inattention

16.95 ± 4.90

10.02 ± 5.84

44.02

2.690E−10

16.45 ± 5.09

17.75 ± 4.51

23.35

6.958E−10

1 < 2 = 3

 HI

13.44 ± 5.69

7.95 ± 5.25

25.28

1.000E−6

12.70 ± 6.11

14.61 ± 4.78

15.30

6.260E−7

1 < 2 < 3

  1. SD standard deviation. FSIQ Full-Scale Intelligence Quotient. ADHD-IA ADHD with inattention; ADHD-HI ADHD with hyperactivity and impulsivity; ADHD-C a combination of both. ASSQ Autism Spectrum Screening Questionnaire. RRBs restrictive and repetitive behaviors. SNAP-IV Swanson, Nolan, and Pelham rating scale, version IV. HI: hyperactivity and impulsivity
  2. aWith two sample t test, χ2 test, or general linear model analysis after controlling for FSIQ, age, and gender, between HC − ATs and ADHD
  3. bWith analysis of variance (ANOVA), χ2, or analysis of covariance (ANCOVA) after controlling for FSIQ, age, and gender, among HC − ATs, ADHD − ATs and ADHD + ATs groups, with Fisher’s exact test between ADHD − ATs and ADHD + ATs groups
  4. cwith least-significant-difference (LSD) t-test among the three groups