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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 RRBIsASDADHDOther NDDTDID
01135663
144490
2113030
371031
441000
521010
620000
1010000
  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