Table 2.5. Admissions aged 12 and older, by age of first use and number of prior treatment episodes according to primary substance of abuse: 2011 Percent distribution
[Based on administrative data reported to TEDS by all reporting States and jurisdictions.]
Age of first use and number of prior treatment episodes	All admis- sions	Primary substance at admission
		Alcohol		Opiates		Cocaine		Mari- juana/ hashish	Metham- phetamine/ amphet- amines	Tran- quil- izers	Seda- tives	Hallu- cino- gens	PCP	Inhal- ants	Other/ none speci- fied
		Alcohol only	With second-ary drug	Heroin	Other opiates	Smoked cocaine	Other route
Age of first use1
12 years or under	12.9	13.9	22.0	2.1	2.7	2.2	3.5	24.7	6.2	3.6	4.7	7.0	4.0	15.5	19.7
13 to 14 years	16.6	17.0	23.9	5.7	5.8	4.3	7.1	31.6	12.7	7.5	7.9	15.4	10.5	20.5	9.5
15 to 16 years	21.0	27.3	27.0	12.4	12.9	9.3	14.9	25.3	17.9	14.4	13.9	22.9	19.7	18.8	14.3
17 to 18 years	16.7	21.6	15.3	19.0	15.8	13.8	18.9	11.3	18.2	13.9	12.4	18.4	20.9	9.9	15.2
19 to 20 years	8.6	7.7	4.8	15.0	12.9	11.7	13.3	3.2	10.1	10.2	9.9	11.3	13.2	4.6	8.4
21 to 25 years	12.3	8.9	4.9	23.2	22.0	25.0	21.4	2.7	15.9	15.7	14.9	11.5	18.9	8.8	13.4
26 to 30 years	5.7	1.8	1.1	12.1	12.3	16.5	10.6	0.7	8.7	11.8	11.6	6.2	7.8	5.0	7.7
Over 30 years	6.1	1.9	1.0	10.5	15.7	17.1	10.2	0.5	10.3	23.0	24.6	7.2	4.9	16.9	11.8
Total	100.0	100.0	100.0	100.0	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	1,816,670	397,959	323,444	277,462	185,889	99,119	44,048	331,931	110,204	17,787	3,623	1,810	5,751	1,196	16,447
No. of prior treatment episodes
None	41.1	47.3	35.6	19.8	43.5	26.1	37.0	57.6	41.7	40.6	53.0	45.6	29.4	46.9	55.7
1	21.9	20.5	21.7	20.1	24.0	20.6	23.2	23.2	25.2	20.1	21.8	22.7	26.3	24.0	18.1
2	12.4	10.6	13.4	15.0	13.0	15.3	14.4	9.8	13.9	12.0	10.4	12.1	17.7	12.5	8.7
3	7.4	5.8	8.4	11.0	7.3	10.9	8.9	4.4	7.5	7.2	6.0	5.9	10.8	6.4	4.8
4	4.3	3.5	5.1	6.9	4.0	7.1	4.9	2.0	4.3	4.5	2.5	3.9	5.8	3.3	2.9
5 or more	13.0	12.4	15.8	27.3	8.2	20.0	11.6	3.0	7.4	15.6	6.4	9.9	10.1	6.9	9.8
Total	100.0	100.0	100.0	100.0	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	1,689,338	358,710	283,553	250,073	174,321	91,992	41,564	323,392	109,129	15,283	3,484	1,751	5,603	1,156	29,327
1 For drugs other than alcohol, this is the age at which the client first used the substance. For alcohol, this is the age at first intoxication.
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.