Table 1 Participant demographics and global brain measures

IoPPN/UCLA/Frankfurt

105.03

< 0.001

F

p

Age [years]

14 ± 6

(6–25)

15 ± 4

(7–23)

15 ± 2

(11–18)

14 ± 4

(7–24)

0.18

0.91

Full-scale IQ

86 ± 15

(60–116)

81 ± 12

(61–112)

96 ± 13

(64–116)

104 ± 11

(76–123)

21.01

< 0.001

ADI-R social¹

5 ± 3

(1–9)

19 ± 5

(9–28)

17 ± 4

(9–27)

n/a

n/a

95.93

< 0.001

ADI-R communication¹

6 ± 4

(0–16)

14 ± 4

(8–24)

13 ± 4

(5–23)

n/a

n/a

29.98

< 0.00

ADI-R repetitive¹

1 ± 2

(0–8)

3 ± 3

(0–10)

5 ± 2

(1–10)

n/a

n/a

16.8

< 0.001

ADOS CSS¹

3 ± 2

(1–8)

6 ± 3

(1–10)

6 ± 3

(1–10)

n/a

n/a

9.3

< 0.001

SRS total score

55 ± 26

(16–103)

101 ± 33

(41–174)

95 ± 29

(42–159)

23 ± 19

(0–75)

69.38

< 0.001

SRS repetitive

9 ± 6

(1–22)

17 ± 7

(7–32)

16 ± 7

(0–34)

2 ± 3

(0–10)

49.31

< 0.001

Total cortical volume [L]

0.66 ± 0.08

(0.41–0.89)

0.68 ± 0.07

(0.52–0.78)

0.75 ± 0.07

(0.60–0.92)

0.73 ± 0.07

(0.59–0.90)

10.56

< 0.001

Total surface area [m²]

0.20 ± 0.02

(0.13–0.25)

0.21 ± 0.02

(0.17–0.24)

0.23 ± 0.02

(0.18–0.27)

0.22 ± 0.02

(0.19–0.27)

12.41

< 0.001

Mean cortical thickness [mm]

2.78 ± 0.13

(2.59–3.06)

2.77 ± 0.10

(2.60–2.96)

2.71 ± 0.10

(2.51–2.93)

2.71 ± 0.10

(2.48–3.01)

3.74

< 0.05