Table 3.3 Clients in treatment, by substance abuse problem and diagnosed co-occurring substance abuse and mental health disorders: 2005-20091 Number and percent
Substance abuse problem and diagnosed co-occurring substance abuse and mental health disorders	Number of clients					Percent distribution
	2005	2006	2007	2008	2009	2005	2006	2007	2008	2009
Total2	1,081,049	1,130,881	1,135,425	1,192,490	1,182,077
Substance abuse problem
Clients with both alcohol and drug abuse	500,234	521,067	509,919	545,330	517,887	46.3	46.1	44.9	45.7	43.8
Clients with drug abuse only	366,640	394,295	412,400	421,583	441,128	33.9	34.9	36.3	35.4	37.3
Clients with alcohol abuse only	199,986	207,194	211,094	222,389	220,373	18.5	18.3	18.6	18.6	18.6
Diagnosed co-occurring substance abuse and mental health disorders	n/a	n/a	416,260	462,260	456,567	n/a	36.7	n/a	38.8	38.6
1 Survey reference dates were: March 31, 2005-2006, March 30, 2007, and March 31, 2008-2009. See Appendix A for changes in the survey base, methods, and instruments that affect analysis of trends over time.
2 Totals include clients in facilities that did not respond to the substance abuse problem question (in 2005, 14,189 clients reported by 306 facilities; in 2006, 8,325 clients reported by 278 facilities; in 2007, 2,011 clients reported by 223 facilities;  in 2008, 3,188 clients reported by 188 facilities; and in 2009, 2,690 clients reported by 152 facilities) and/or the co-occurring disorders question (in 2007, 17,399 clients reported by 338 facilities; and in 2008, 15,462 clients reported by 263 facilities; and in 2009, 13,067 clients reported by 220 facilities).
n/a  Not collected until 2007.
SOURCE: Office of Applied Studies, Substance Abuse and Mental Health Services Administration, National Survey of Substance Abuse Treatment Services (N-SSATS), 2005-2009.