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Table 2 Frequency distribution of RRBI symptoms (ADI-R C) across diagnostic groups

From: Sex differences in brain structure: a twin study on restricted and repetitive behaviors in twin pairs with and without autism

Number of RRBIs

ASD

ADHD

Other NDD

TD

ID

0

1

13

5

66

3

1

4

4

4

9

0

2

11

3

0

3

0

3

7

1

0

3

1

4

4

1

0

0

0

5

2

1

0

1

0

6

2

0

0

0

0

10

1

0

0

0

0

  1. ASD autism spectrum disorder, ADHD attention deficit hyperactivity disorder (but no co-morbid ASD), Other NDD other neurodevelopmental disorder (but no co-morbid ASD or ADHD), TD typically developing, ID intellectual disability
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