Why is ADD/ADHD Diagnosed more often in Boys than Girls?

Why is ADD/ADHD Described as being more common in Boys than Girls?

ADD/ADHD used to be recognized only as a childhood disorder. ADD/ADHD boys are more likely to be obviously hyperactive and explosive than ADD/ADHD girls, and they are more likely to be recognized and treated by physicians because their problems are more evident and severe.

The incidence of ADD/ADHD in my medical practice study population of over thirteen hundred males and females of all ages (from 2 to 82 years old when first diagnosed), however, shows that females are equally as likely as males to have ADD/ADHD. Females are much more likely to be diagnosed in adulthood while males with ADD/ADHD are commonly recognized in the childhood or the teenage years by Pediatricians.