Table 1.

Age, education and drug use data at treatment entry.

	CocPos group (N = 11)		CocNeg group (N = 8)
	Range	Mean (S.D.)	Range	Mean (S.D.)
Age/years	30–49	40.2 (6.0)	31–44	37.5 (5.4)
Years of education	12–14	12.6 (1.1)	12–18	13(2.1)
Years of cocaine use	5–25	14.2 (6.6)	8–25	15.6(5.7)
Years of alcohol use	0–40	20.3 (11.1)	4–25	16.6(6.4)
Days since last cocaine use	1–12	4.5 (4.2)	2–10	5.5 (3.8)
Number of subjects had other drugs at admission	4THCa	–	3 THC	–

^aTHC: tetrahydrocannabinol.