(KCEN) -- Boys are more likely to be diagnosed with ADHD than girls.
And some states actually medicate their kids more than others.
In 2007 there were four million children diagnosed with ADHD in the U.S.
Two out of three were taking medication to treat the condition. But medication rates apparently are significantly different between states.
In Nevada, a third of kids diagnosed with ADHD were treated with medicine. That's compared to a whopping 80 percent in Mississippi.
Researchers also found boys were medicated more often than girls.
The uneven distribution of ADHD medication may be because of drug shortages in some areas.