Citera: The scientists focused on a sequence of genes linked to brain development that has previously been connected to conditions like autism and schizophrenia.
In children without ADHD, about 7% of them had deleted or doubled chromosomes in the analysed gene sequence. But among children with the disorder, researchers discovered about 14% had such genetic alterations.
Scientists also found that 36% of children with learning disabilities in the study had the chromosomal abnormalities, compared to those with a normal IQ. | 
