Table 3.6. Heroin admissions aged 12 and older, by usual route of administration, age group, and characteristics of first treatment episode: 2002-2012 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	2002	2003	2004	2005	2006	2007	2008	2009	2010	2011	2012
Total heroin admissions	285,041	274,431	262,430	260,654	268,376	262,710	281,410	286,959	266,048	283,092	285,451
Injection	61.6	60.4	62.1	62.8	63.6	64.2	64.8	66.7	69.3	69.9	70.6
Age group
12 to 19 years	1.8	1.8	1.9	2.0	1.9	1.9	2.1	2.5	2.5	2.3	2.3
20 to 34 years	25.6	26.1	28.0	29.1	30.8	32.2	34.3	37.4	40.7	42.4	43.7
35 to 44 years	19.2	17.8	17.3	16.8	15.9	15.3	14.1	13.5	13.0	12.8	12.4
45 years and older	15.0	14.8	14.9	14.9	15.0	14.7	14.2	13.2	13.0	12.4	12.1
First treatment episode (%)	20.4	19.9	19.4	23.2	22.3	20.5	20.4	21.2	18.5	18.6	18.6
Average years of use before     first treatment episode	12.4	12.7	12.6	12.9	13.6	13.5	12.6	11.6	10.7	9.9	9.4
Inhalation	33.2	34.1	33.0	33.1	32.4	31.7	30.9	28.8	25.8	24.7	23.8
Age group
12 to 19 years	0.8	0.8	0.7	0.8	0.7	0.6	0.7	0.6	0.5	0.5	0.5
20 to 34 years	12.7	12.0	11.1	10.6	9.6	8.9	8.9	8.5	7.7	7.5	7.9
35 to 44 years	13.3	13.8	13.4	13.2	12.5	11.9	11.0	9.6	8.0	6.9	6.0
45 years and older	6.4	7.5	7.8	8.5	9.6	10.2	10.4	10.1	9.6	9.8	9.3
First treatment episode (%)	25.7	25.0	25.6	28.8	27.7	24.0	23.3	24.5	21.5	20.0	19.5
Average years of use before     first treatment episode	12.1	13.0	13.2	13.1	14.1	15.0	14.2	14.3	14.5	13.6	12.5
Other	5.2	5.5	4.9	4.1	4.0	4.1	4.3	4.5	4.9	5.4	5.7
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	266,418	256,288	244,105	258,382	266,500	261,289	279,872	286,130	265,203	282,125	284,387
SOURCE: Center for Behavioral Health Statistics and Quality, Substance Abuse and Mental Health Services Administration, Treatment Episode Data Set (TEDS). Data received through 10.17.13.