Table 4.

Prevalence of drug use (n = 2,543)

			In last 6 months
	Ever used		Used drug		“High” during sex
Drug	weighted %	95% CI	weighted %	95% CI	weighted %	95% CI
Alcohol	78.0	75.2-80.8	58.3	55.4-61.1	28.3	25.6-31.1
Marijuana	53.3	49.0-57.4	34.5	30.7-38.2	20.6	17.9-23.3
Cocaine	16.4	13.1-19.5	7.4	5.1-9.7	4.6	2.5-6.6
Speed	12.6	10.1-15.0	4.9	3.7-6.2	2.7	2.0-3.5
LSD	11.7	8.4-13.8	2.7	1.7-3.6	1.0	0.5-1.4
Heroin	4.4	3.0-5.7	1.8	1.1-2.3	1.2	0.6-1.8
PCP	1.8	1.3-2.4	0.3	0.1-0.6	0.2	<0.1-0.4
Prescribed methadone	1.0	0.6-1.5	0.6	0.2-0.9	0.3	0.1-0.5
Nonprescribed methadone	0.3	<0.1-0.5	0.2	0-0.3	<0.1	<0.1-0.1
Other drugs	3.7	2.4-4.9	1.7	1.1-2.4	0.4	0.2-0.7
Any injected drug	3.4	2.3-4.5	1.8	1.0-2.7	1.4	0.7-2.1
CI = confidence interval; PCP = phencyclidine.