Table 1.

Variation among states and counties in percentages of children and adults treated with stimulant drugs in March 2008^a

State or county	Percentile				Ratio of 75th:25thpercentiles	Mean	COVb
	Lowest	25th	50th	75th
States
Children (≤17 years)	.4	1.7	2.7	3.4	2.0	2.6	.42
Male	.5	2.4	3.7	4.7	2.0	3.6	.41
Female	.2	1.0	1.6	2.0	2.0	1.5	.45
Adults (>17 years)	.2	.5	.6	.8	1.5	.7	.39
Male	.2	.5	.6	.7	1.5	.6	.40
Female	.2	.6	.7	.8	1.4	.7	.39
Counties
Children (≤17 years old)	<.1	.8	1.8	3.5	4.6	2.5	.97
Male	.1	1.1	2.6	4.9	4.3	3.5	.96
Female	<.1	.5	1.1	2.2	4.3	1.6	.93
Adults (>17 years old)	<.1	.5	.3	.6	4.4	.5	1.01
Male	<.1	.2	.3	.6	4.1	.4	1.00
Female	.1	.2	.3	.7	4.3	.5	1.00

^aPercent of persons in treatment derived from LRx Data, 2008, provided by IMS Health, and from 2008 population estimates for states and counties, standardized by age and gender, from the U.S. Census Bureau

^bCoefficient of variation