Abstract  The behavioural profiles in N = 69 index children with attention-deficit/hyperactivity disorder (ADHD), N = 32 siblings with ADHD, N = 35 siblings without ADHD, and N = 36 normal controls were compared by the use of standardized parent and teacher rating scales. The four groups were matched
by age and IQ. The behavioural profiles of the two ADHD groups were very similar not only in the behavioural domains of ADHD,
but also in scales measuring emotional and conduct problems. Siblings without ADHD shared more similarities with normal controls
except for more emotional problems. These general trends were stronger in the parent compared to the teacher ratings. These
findings indicate that not only ADHD-related but also other behav...

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