Table 3.6 Heroin admissions aged 12 and older by usual route of administration, age group, and characteristics of first treatment episode: TEDS 1998-2008 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	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007	2008
Total heroin admissions	246,788	257,208	269,967	277,243	284,200	273,567	261,312	259,630	265,962	248,061	267,335
Injection	64.9	65.1	62.6	61.0	61.5	60.4	62.2	62.8	62.9	64.1	64.9
Age group
12 to 19 years	2.0	1.9	1.9	1.8	1.8	1.8	1.9	2.0	1.9	1.8	2.1
20 to 34 years	24.3	24.6	24.1	24.9	25.6	26.0	28.0	29.1	30.0	31.8	34.3
35 to 44 years	25.2	24.0	22.0	20.2	19.2	17.8	17.4	16.8	15.9	15.5	14.2
45 years and older	13.5	14.6	14.7	14.1	15.0	14.8	14.8	14.8	15.1	15.0	14.2
First treatment episode (%)	18.7	19.5	19.9	19.4	20.3	19.9	19.3	23.3	23.6	21.5	20.4
Average years of use before 1st treatment episode	13.5	14.1	13.1	12.8	12.4	12.7	12.6	12.9	13.6	13.5	12.6
Inhalation	30.2	29.6	32.0	33.6	33.2	34.1	32.9	33.1	33.2	31.8	30.8
Age group
12 to 19 years	1.1	1.0	0.9	0.8	0.8	0.8	0.7	0.8	0.7	0.6	0.6
20 to 34 years	14.4	13.7	13.8	13.7	12.7	12.0	11.1	10.6	9.7	8.9	8.8
35 to 44 years	10.8	10.8	12.3	13.3	13.3	13.8	13.3	13.2	12.9	11.9	11.0
45 years and older	3.9	4.0	5.0	5.7	6.4	7.5	7.8	8.5	9.9	10.3	10.4
First treatment episode (%)	25.6	24.4	25.8	26.0	25.7	25.0	25.4	28.8	28.7	24.3	23.5
Average years of use before 1st treatment episode	9.7	9.9	11.1	11.7	12.1	13.0	13.2	13.1	14.0	14.9	14.2
Other	4.8	5.3	5.4	5.4	5.2	5.5	4.9	4.1	3.9	4.2	4.3
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	229,370	240,165	252,372	259,131	265,577	255,424	242,987	257,362	264,098	246,749	265,859
SOURCE: Office of Applied Studies, Substance Abuse and Mental Health Services Administration, Treatment Episode Data Set (TEDS). Data received through 8.31.09.