Table 5.7b Heroin admissions by selected usual route of administration, according to age group: TEDS 1996-2006 Percent distribution
[Based on administrative data reported to TEDS by all reporting States and jurisdictions. See Table 4.2a.]
Usual route of administration  and age group1	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006
Injection
Age group	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Under 20 years	1.7	2.4	3.1	3.0	3.0	3.0	2.9	2.9	3.1	3.2	3.0
20 to 29 years	18.1	20.0	21.6	22.9	24.0	26.6	27.9	29.5	32.0	33.2	35.1
30 to 39 years	40.0	37.2	34.7	33.1	31.8	30.7	29.1	28.1	26.9	26.6	26.0
40 years and over	40.2	40.4	40.6	41.0	41.2	39.7	40.0	39.5	38.0	36.9	36.0
Inhalation
Age group	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Under 20 years	2.9	3.7	3.7	3.5	2.8	2.5	2.4	2.4	2.2	2.3	2.3
20 to 29 years	30.6	28.5	26.6	24.8	22.5	21.1	19.9	18.5	19.0	19.2	19.2
30 to 39 years	43.4	42.7	41.8	42.3	42.4	41.8	39.9	37.8	35.2	32.7	29.8
40 years and over	23.2	25.1	27.9	29.3	32.2	34.6	37.7	41.3	43.5	45.7	48.7
Smoking
Age group	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Under 20 years	6.4	6.1	6.7	7.7	6.9	5.6	5.1	5.3	5.5	6.3	7.3
20 to 29 years	31.5	31.1	32.7	34.8	32.2	30.8	31.9	31.5	31.5	35.1	40.9
30 to 39 years	37.8	37.0	34.9	32.5	32.8	31.2	31.5	30.0	29.5	25.7	22.2
40 years and over	24.3	25.8	25.6	25.0	28.0	32.4	31.5	33.2	33.5	32.9	29.5
1 Usual route of administration and/or age group were not reported for all admissions.
SOURCE: Office of Applied Studies, Substance Abuse and Mental Health Services Administration, Treatment Episode Data Set (TEDS). Data received through 10.9.07.