University College London Jan 23 2025 Adults who have been diagnosed with attention deficit hyperactivity disorder (ADHD) may be living shorter lives than they should, finds a world-first study led by UCL researchers. The research, published in The British Journal of Psychiatry , analyzed anonymized primary care data from 30,029 adults across the UK with diagnosed ADHD. They then compared this group with 300,390 participants without ADHD, who were matched by age, sex, and primary care practice.