Fig. 2

Class profiles of IQ and ASD, ADHD, and comorbid symptoms. Each bar represents the mean z score (± 1 S.E.) for ADHD symptoms from Conners’ Parents Rating Scale (CPRS), Conners’ Teachers Ratings Scale (CTRS), and the Children’s Social Behaviour Questionnaire (CSBQ). IQ z scores were reversed (higher IQ z score = lower IQ). One asterisk indicates the significant difference between classes 1 and 4. Two asterisks indicate the significant differences between classes 1 and 4 or classes 2 and 4. Three asterisks indicate the significant differences between class 4 and classes 1, 2, and 3