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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Psychopharmacology (Berl). 2012 Nov 9;226(2):307–319. doi: 10.1007/s00213-012-2908-5

Table 2.

Substance use characteristics of adolescent marijuana users and Non-users.

Non-users n = 48 Marijuana users n = 45

Current Marijuana & other drug use N (%) N (%) χ2 df p-value
Marijuana 85.31 2 .000
 0 joints/week 48 (100) 0 (0.0)
 0–3 joints/week 0 (0.0) 9 (20.0)
 > 3 joints/week 0 (0.0) 36 (80.0)
Alcohol 23.63 2 .000
 0 drinks/week 43 (89.6) 19 (42.2)
 1–7 drinks/week 3 (6.3) 19 (42.2)
 > 7 drinks/week 2 (4.2) 7 (15.6)
Cigarettes 42.00 3 .000
 0/day 47 (97.9) 16 (35.6)
 1–4/day 0 (0.0) 13 (28.6)
 5–10/day 1 (2.1) 12 (26.7)
 > 10/day 0 (0.0) 4 (8.9)
Lifetime other drug use N (%) N (%) χ2 df p-value

Alcohol 27.41 2 .000
 Never used 28 (58.3) 7 (15.6)
 1–10 uses 12 (25.0) 7 (15.6)
 > 10 uses 8 (16.7) 31 (68.9)
Cigarettes 60.56 2 .000
 Never used 36 (75.0) 1 (2.2)
 1–50 uses 11 (22.9) 14 (31.1)
 > 50 uses 1 (2.1) 30 (66.7)
Stimulants 2.18 1 .140
 Ever used 0 (0.0) 2 (4.4)
Narcotics 9.34 1 .002
 Ever used 0 (0.0) 8 (17.8)
Benzodiazepines 10.63 1 .001
 Ever used 0 (0.0) 9 (20.0)