Table 2.

Presence of drug and alcohol use at entrance and exit^a

Drug	Entranceb (n = 361) %	Entrancec (n = 277) %	Exitd (n = 277) %
Cocaine	12.2	8.3	11.2
Amphetamines and stimulants	6.9	6.5	11.2
Methamphetamine	2.8	2.5	4.3
Ecstasy (3,4-methylenedioxymethamphetamine [MDMA])	5.5	5.1	9.0
Amphetamine	1.7	1.8	1.8
3,4-methylenedioxyamphetamine (MDA)	1.7	1.8	4.0
3,4-methylenedioxy-N-ethylamphetamine (MDEA)	0.3	0.4	0
Marijuana/hashish	12.7	11.9	11.6
PCP (phencyclidine)	0.6	0	0
Painkillers	0.8	0.7	1.1
Codeine	0.3	0.0	0.4
Oxycodone	0.3	0.4	0.4
Hydrocodone	0.3	0.4	0.4
GHB (gamma-hydroxybutyrate; liquid ecstasy/G), self-report only	0	0	0.7
Ketamine (K, special K)	0	0	0.4
Fluoxetine	0.3	0.4	0
Sertaline	0.3	0	0
Any drugs	24.4	20.9	26.0

^aAll data are based on oral assay except for GHB, for which no oral assay test is available and only self-report is used. Substances that were tested for but had no positive results were removed from above table: methadone, 6-acetylmorphine (metabolite of heroin), and hydromorphone;

^bentrance survey data regardless of whether participants completed the exit survey;

^centrance survey data only for participants that also completed the exit survey;

^dexit survey data.