Table 1.
Demographic and baseline characteristics
| Variable | Never marijuana users |
Former marijuana users |
Current marijuana users |
Significance test value (df), p |
|---|---|---|---|---|
| n | 66 | 124 | 49 | |
| Clinic, % (n) | χ2 (2) = 3.58, .17 | |||
| A | 21.2 (14) | 25.8 (32) | 36.7 (18) | |
| B | 78.8 (52) | 74.2 (92) | 63.3 (31) | |
| Age | 43.3 ± 11.1a | 35.8 ± 10.8b | 34.7 ± 9.5b | F (2, 236) = 13.08, .000 |
| Male, % (n) | 51.5 (34) | 61.3 (76) | 53.1 (26) | χ2 (2) = 2.05, .36 |
| Married, % (n) | 13.6 (9) | 12.3 (15) | 12.2 (6) | χ2 (2) = 0.08, .96 |
| Years of education | 13.1 ± 2.4a | 12.2 ± 1.95b | 12.7 ± 1.7ab | F (2, 235) = 4.56, .01 |
| Income | $15,508 ± 23,956 | $12,318 ± 17,315 | $19,175 ± 23,310 | F (2, 234) = 1.08, .34 |
| Race/ethnicity, % (n) | χ2 (6) = 7.68, .26 | |||
| African American | 36.4 (24) | 25.8 (32) | 34.7 (17) | |
| European American | 51.5 (34) | 63.7 (79) | 44.9 (22) | |
| Hispanic American | 7.6 (5) | 8.1 (10) | 14.3 (7) | |
| Other | 4.5 (3) | 2.4 (3) | 6.1 (3) | |
| DSM-IV diagnoses, % (n) | ||||
| Alcohol dependence | 60.6 (40) | 54.0 (67) | 63.3 (31) | χ2 (2) = 1.53, .46 |
| Cocaine dependence | 50.0 (33)a | 68.5 (85)b | 73.5 (36)b | χ2 (2) = 8.66, .01 |
| Opioid dependence | 12.1 (8)a | 37.9 (47)b | 34.7 (17)b | χ2 (2) = 14.21, .001 |
| Past month marijuana use, days | 0.0 (0.0)a | 0.0 (0.0)a | 6.4 (7.4)b |
Kruskal Wallis (KW) χ 2 (2) = 234.10, .000 |
| Years regular marijuana use | 0.0 (0.0) | 8.6 (7.0) | 13.6 (9.1) | KW χ2 (2) = 150.43, .000 |
| Heterosexual, % (n) | 95.2 (60) | 88.5 (108) | 89.6 (43) | χ2 (2) = 2.26, .32 |
| Current legal problems,% (n) | 24.6 (16) | 25.8 (32) | 32.7 (16) | χ2 (2) = 1.07, .59 |
Values are means and standard deviations unless noted. Income was log transformed prior to analyses. Groups with different superscripts differ from one another in post-hoc tests.