Table 3.3 Clients in treatment by substance abuse problem treated: 1998-20041 Number and percent distribution
Substance abuse problem	Number of clients2					Percent distribution
	1998	2000	2002	2003	2004	1998	2000	2002	2003	2004
Total	1,038,378	984,296	1,123,239	1,084,116	1,066,351	100.0	100.0	100.0	100.0	100.0
Clients with alcohol abuse only	246,726	222,193	237,302	219,453	210,696	23.8	22.6	21.1	20.2	19.8
Clients with both alcohol and drug abuse	512,676	475,095	539,419	508,300	493,552	49.4	48.3	48.0	46.9	46.3
Clients with drug abuse only	278,976	287,008	346,518	356,363	362,103	26.9	29.2	30.8	32.9	34.0
1 Survey reference dates were: Oct. 1, 1998-2000, March 29, 2002, and March 31, 2003-2004. See Appendix C 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 2000, 16,591 clients reported by 354 facilities; in 2002, 13,048 clients reported by 276 facilities; in 2003, 8,430 clients reported by 217 facilities; in 2004, 5,900 clients reported by 241 facilities.
SOURCE: Office of Applied Studies, Substance Abuse and Mental Health Services Administration, Uniform Facility Data Set (UFDS), 1998; National Survey of Substance Abuse Treatment Services (N-SSATS), 2000, 2002-2004. No client data were collected in 1999, and no survey was conducted in 2001.