Researchers say an increase of 22 percent of ADHD cases since 2003 is due to more awareness and screening.
For more information on ADHD, check out the following resources:
The best overall guide comes from the National Institute of Mental Health:http://www.nimh.nih.gov/health/publications/attention-deficit-hyperactivity-disorder/complete-index.shtml
The Mayo Clinic also has a good guide here: http://www.mayoclinic.com/health/adhd/DS00275
The Duke program mentioned in our report: http://www.dukehealth.org/services/attention_deficit_hyperactivity_disorder/about