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: 2010 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	13.4	14.1	22.7	2.2	2.8	2.2	3.7	24.3	6.2	3.6	4.6	7.5	4.4	13.7	18.1
13 to 14 years	16.7	16.6	23.9	5.8	5.7	4.3	7.0	30.7	12.9	7.5	7.9	16.5	10.9	18.4	11.0
15 to 16 years	21.3	27.5	27.0	12.4	12.6	9.2	14.8	25.4	18.0	14.4	12.8	24.4	19.5	17.8	16.4
17 to 18 years	17.1	21.8	15.3	19.4	16.7	13.7	19.4	12.3	17.9	14.4	12.9	19.4	20.8	11.9	14.7
19 to 20 years	8.4	7.8	4.5	14.7	12.7	12.9	13.9	3.3	10.2	9.5	10.0	9.3	12.5	7.1	9.1
21 to 25 years	11.9	8.8	4.6	23.1	21.6	24.3	20.9	2.7	16.0	16.3	15.4	11.5	20.1	10.2	13.7
26 to 30 years	5.4	1.7	1.0	11.8	12.2	16.2	10.5	0.7	8.6	11.6	11.3	5.1	8.0	7.6	6.8
Over 30 years	5.8	1.7	0.9	10.5	15.7	17.2	9.8	0.5	10.2	22.6	25.1	6.3	3.9	13.4	10.1
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	1,786,869	407,993	331,124	255,589	155,722	103,786	43,149	332,674	111,769	15,624	4,087	1,659	4,489	1,441	17,763
No. of prior treatment episodes
None	40.4	46.4	35.2	20.1	40.0	25.8	35.5	55.8	41.8	36.3	52.9	48.2	30.8	54.6	56.9
1	22.2	21.2	22.2	19.3	25.3	21.2	24.0	23.8	25.3	22.0	22.4	22.0	25.3	19.8	16.9
2	12.6	10.7	13.8	14.7	13.9	15.5	14.9	10.4	14.5	12.8	11.4	10.7	16.7	10.8	7.1
3	7.5	5.9	8.5	11.2	7.8	11.0	8.7	4.6	7.4	7.5	5.1	7.1	10.8	4.5	4.1
4	4.2	3.4	5.1	6.7	4.1	6.9	4.8	2.1	4.0	4.6	2.6	3.8	5.8	2.7	2.2
5 or more	13.0	12.4	15.3	28.0	8.9	19.6	12.1	3.3	7.0	16.8	5.7	8.2	10.7	7.6	12.8
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	1,652,662	366,226	288,578	228,510	145,639	96,004	40,566	322,085	109,515	13,116	3,819	1,611	4,380	1,412	31,201
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 10.10.11.