Table 3.6. Heroin admissions aged 12 and older, by usual route of administration, age group, and characteristics of first treatment episode: 2001-2011 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	2001	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011
Total heroin admissions	277,556	285,036	274,502	262,506	260,690	267,511	261,951	280,692	285,983	264,277	278,481
Injection	61.0	61.6	60.5	62.1	62.8	63.6	64.2	64.8	66.7	69.3	69.8
Age group
12 to 19 years	1.8	1.8	1.8	1.9	2.0	1.9	1.9	2.1	2.5	2.5	2.3
20 to 34 years	24.9	25.6	26.1	28.0	29.1	30.8	32.3	34.3	37.4	40.7	42.4
35 to 44 years	20.2	19.2	17.8	17.3	16.8	15.9	15.3	14.1	13.6	13.0	12.8
45 years and older	14.1	15.0	14.8	14.9	14.9	15.0	14.7	14.2	13.2	13.0	12.4
First treatment episode (%)	19.4	20.4	19.9	19.3	23.2	22.2	20.4	20.4	21.2	18.4	18.2
Average years of use before     first treatment episode	12.8	12.4	12.7	12.6	12.9	13.6	13.5	12.5	11.6	10.7	9.9
Inhalation	33.6	33.2	34.1	33.0	33.1	32.5	31.7	30.9	28.9	25.8	24.9
Age group
12 to 19 years	0.8	0.8	0.8	0.7	0.8	0.7	0.6	0.7	0.6	0.5	0.5
20 to 34 years	13.7	12.7	12.0	11.1	10.6	9.7	9.0	8.9	8.5	7.7	7.5
35 to 44 years	13.3	13.3	13.8	13.4	13.2	12.5	12.0	11.0	9.6	8.0	7.0
45 years and older	5.7	6.4	7.5	7.8	8.5	9.6	10.2	10.4	10.1	9.7	9.9
First treatment episode (%)	26.0	25.7	25.0	25.6	28.8	27.7	24.0	23.3	24.5	21.4	19.8
Average years of use before     first treatment episode	11.7	12.1	13.0	13.2	13.1	14.1	15.0	14.2	14.3	14.4	13.6
Other	5.4	5.2	5.5	4.9	4.1	4.0	4.1	4.3	4.4	4.9	5.3
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	259,444	266,412	256,359	244,181	258,417	265,646	260,533	279,154	285,161	263,448	277,556
SOURCE: Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration, Treatment Episode Data Set (TEDS). Data received through 10.15.12.