From Science Daily:
People With ADHD Do One Month's Less Work Per Year, Study Finds
ScienceDaily (May 28, 2008) — Workers with attention deficit hyperactivity disorder (ADHD) do 22 days less work per year than people who do not have the disorder, finds new research. So much work is being lost that the researchers recommend employers consider screening staff for ADHD and providing treatment for those affected, because it would be more cost-effective for their businesses.
People who have ADHD find it difficult to concentrate because they may be hyperactive, easily distracted, forgetful or impulsive. Children with the disorder are being increasingly diagnosed because they are likely to be tested for ADHD if they have problems with their schoolwork. However, many adults with ADHD do not know they have the condition.
Read the rest here.