Table 3.6. Heroin admissions aged 12 and older, by usual route of administration, age group, and characteristics of first treatment episode: 1999-2009 Percent distribution
[Based on administrative data reported to TEDS by all reporting States and jurisdictions.]
Usual route of administration,age group, and characteristics of first treatment episode	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008	2009
Total heroin admissions	257,208	269,875	277,268	284,324	273,756	262,278	260,591	268,731	262,579	281,159	282,212
Injection	65.1	62.6	61.0	61.6	60.4	62.1	62.8	63.6	64.2	64.7	66.6
Age group
12 to 19 years	1.9	1.9	1.8	1.8	1.8	1.9	2.0	1.9	1.9	2.1	2.5
20 to 34 years	24.6	24.1	24.9	25.6	26.0	28.0	29.1	30.9	32.4	34.3	37.4
35 to 44 years	24.0	22.0	20.2	19.2	17.8	17.3	16.8	15.9	15.3	14.1	13.6
45 years and older	14.6	14.7	14.1	15.0	14.8	14.9	14.8	14.9	14.6	14.2	13.2
First treatment episode (%)	19.5	19.9	19.4	20.4	19.9	19.4	23.3	22.4	20.6	20.6	21.3
Average years of use before     first treatment episode	14.1	13.1	12.8	12.4	12.7	12.6	12.9	13.6	13.4	12.5	11.6
Inhalation	29.6	31.9	33.6	33.2	34.1	33.0	33.1	32.4	31.7	31.0	28.9
Age group
12 to 19 years	1.0	0.9	0.8	0.8	0.8	0.7	0.8	0.7	0.6	0.7	0.6
20 to 34 years	13.7	13.8	13.7	12.7	12.0	11.1	10.6	9.7	9.0	8.9	8.5
35 to 44 years	10.8	12.3	13.3	13.3	13.8	13.4	13.2	12.5	11.9	11.0	9.6
45 years and older	4.0	5.0	5.7	6.4	7.5	7.8	8.5	9.6	10.2	10.4	10.1
First treatment episode (%)	24.4	25.8	26.0	25.7	25.0	25.6	29.0	28.0	24.1	23.6	24.7
Average years of use before     first treatment episode	9.9	11.1	11.7	12.1	13.0	13.2	13.1	14.0	14.9	14.2	14.2
Other	5.3	5.4	5.4	5.2	5.5	4.9	4.1	4.0	4.1	4.3	4.4
Total	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
No. of admissions	240,165	252,280	259,156	265,701	255,613	243,953	258,318	266,865	261,147	279,576	281,411
SOURCE: Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration, Treatment Episode Data Set (TEDS). Data received through 11.03.10.