http://www.independent.co.uk/life-s...ply-be-immature-for-their-class-a6922301.html And/or just badly behaved? Many children diagnosed with attention deficit hyperactivity disorder (ADHD) may simply be immature compared to their school classmates, a new study suggests. Researchers examined medical records of nearly 400,000 children aged from four to 17 in Taiwan and found rates of the condition changed significantly depending on the month when they were born, The Daily Telegraph reported. Just 2.8 per cent of boys and 0.7 per cent of girls born in September were diagnosed with ADHD, compared to 4.5 per cent of boys and 1.2 per cent of girls born in August. Dr Mu-Hong Chen, a psychologist at Taipei Veterans General Hospital in Taiwan and lead author of a paper about the research in the Journal of Pediatrics, said: “When looking at the database as a whole, children born in August were more likely to be diagnosed with ADHD and/or receive ADHD medication than those born in September.