Table 5.5b Heroin admissions by selected route of administration, according to age group: TEDS 1992-2000 Percent distribution
[Based on administrative data reported to TEDS by all reporting States and jurisdictions. See Table 4.2.]
Route of administration, age group, and characteristics of first treatment episode¹	1992	1993	1994	1995	1996	1997	1998	1999	2000
Injection
Age group	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Under 20 years	0.8	0.8	0.8	1.2	1.7	2.4	3.1	3.0	3.0
20 to 29 years	19.9	18.2	16.9	17.1	18.0	19.8	21.5	22.7	23.7
30 to 39 years	49.0	47.0	44.4	42.0	40.0	37.1	34.5	32.9	31.7
40 years and over	30.3	34.0	37.8	39.7	40.3	40.7	40.9	41.4	41.6
Inhalation
Age group	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Under 20 years	3.8	3.2	2.8	3.1	3.0	3.8	3.9	3.7	3.0
20 to 29 years	41.4	38.7	36.4	34.7	31.1	29.1	27.3	25.4	23.0
30 to 39 years	40.8	41.7	42.0	42.1	43.2	42.4	41.5	42.2	42.4
40 years and over	14.0	16.4	18.8	20.2	22.8	24.7	27.3	28.7	31.5
Smoking
Age group	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Under 20 years	3.8	3.9	4.5	5.6	6.6	6.5	6.9	7.9	7.3
20 to 29 years	36.5	32.1	31.1	32.0	31.8	32.2	33.5	35.7	33.0
30 to 39 years	43.5	44.9	42.8	41.4	37.4	36.1	34.6	31.9	32.4
40 years and over	16.2	19.1	21.6	21.1	24.3	25.2	25.0	24.5	27.3
¹ 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) - 4.1.02.