Table 3.3 Clients in treatment, by substance abuse problem: 2003-2007¹ Number and percent distribution
Substance abuse problem and co-occurring mental health disorder	Number of clients					Percent distribution
	2003	2004	2005	2006	2007	2003	2004	2005	2006	2007
Substance abuse problem
Total²	1,084,116	1,066,351	1,066,860	1,122,556	1,133,414	100.0	100.0	100.0	100.0	100.0
Clients with alcohol abuse only	219,453	210,696	199,986	207,194	211,094	20.2	19.8	18.7	18.5	18.6
Clients with both alcohol and drug abuse	508,300	493,552	500,234	521,067	509,920	46.9	46.3	46.9	46.4	45.0
Clients with drug abuse only	356,363	362,103	366,640	394,295	412,400	32.9	34.0	34.4	35.1	36.4
¹ Survey reference dates were: March 31, 2003-2006, and March 30, 2007. See Appendix A for changes in the survey base, methods, and instruments that affect analysis of trends over time.
² Tabulations exclude clients in facilities that did not respond to this question: in 2003, 8,430 clients reported by 217 facilities; in 2004, 5,900 clients reported by 245 facilities; in 2005, 14,189 clients reported by 307 facilities; and in 2006, 8,325 clients reported by 278 facilities; and in 2007, 2,011 clients reported by 225 facilities.
SOURCE: Office of Applied Studies, Substance Abuse and Mental Health Services Administration, National Survey of Substance Abuse Treatment Services (N-SSATS), 2003-2007.