TABLE 3—

Sociodemographic Characteristics and Geographic Distribution in 1990 and Prevalence of Injection Drug Use Among Black Adults in 93 Large US Metropolitan Statistical Areas (MSAs) in 1998

MSA Characteristic	Statistic
Adult population size in 1990, median (range)	720 975 (256 123–5 684 204)
Racial/ethnic composition in 1990, median % (range)
White, Non-Hispanic	79.00 (25.58–97.95)
Black, Non-Hispanic	9.28 (0.90–40.59)
US region, no.
Northeast	24
South	21
Midwest	21
West	27
Isolation index in 1990, median (range)	0.48 (0.05–0.84)
Relative concentration index, 1990, median (range)	0.72 (−1.02–0.94)
Injection drug use prevalence (per 100 000) among Black adults aged 19–65 y in 1998, median (interquartile range)	1983.43 (1421.56–2758.59)