TABLE 2—

Description of Databases Analyzed to Calculate the Prevalence of Injection Drug Use Among Black Adults in 93 Large US Metropolitan Statistical Areas, 1998

Database Characteristics	Treatment Episode Data Set (TEDS)	HIV Counseling and Testing Service	AIDS Public Information Database
Description	SAMHSA database recording admissions to public and private drug treatment facilities licensed by the state.	CDC database documenting HIV test incidents at 11 640 HIV counseling and testing sites. Participating sites include family planning and STD clinics, hospitals and private medical centers, drug treatment programs, correctional facilities, and freestanding counseling and testing clinics.98	CDC database describing newly diagnosed cases of AIDS.
Coverage	SAMHSA estimates that the 1997 TEDS database described 87% of all admissions to facilities participating in TEDS and 67% of admissions to all treatment programs nationwide.99	No coverage estimates are available.	85% of all AIDS cases are eventually reported in most areas.100

Note. CDC = Centers for Disease Control and Prevention; SAMHSA = Substance Abuse and Mental Health Services Administration.