More than 50% of youth with attention-deficit/hyperactivity disorder will have persistence of the condition into adulthood...Compared with those for whom the condition remits by adulthood, those with persistent ADHD are more likely to experience social, educational, emotional, and cognitive challenges...researchers at McGill University in Montreal, Canada, and several US universities investigated 8 factors pertaining to childhood functioning and family characteristics to determine whether they are associated with ADHD symptoms in adulthood.