Table 2.

Prevalence of ADHD as a function of geographic region

	2003		2007		2011
Region	Mean %	SD	Mean %	SD	Mean %	SD
Northeast	7.92	1.13	9.46	0.97	10.96	1.72
Midwest	7.87	1.05	9.82	2.03	11.93	2.03
South	9.41	1.05	11.74	2.28	13.51	2.49
West	6.41	0.80	7.73	1.28	8.75	1.67

Note. Mean percentage of children or adolescents ages 4–17 ever diagnosed with ADHD as of that year; SD, standard deviation. Northeast, n = 9, Midwest, n = 12.

South, n = 17, West, n = 13.