Table 1.
Characteristics of cannabis users by cannabis use subgroup membership (n = 266).
| Characteristics | Cannabis use subgroup | Total | ||
|---|---|---|---|---|
| Experimental cannabis-only users | Regular cannabis-only users | Regular cannabis-plus users | m(SD)/% | |
| n (%) | 57 (21.43) | 91 (34.21) | 118 (44.36) | |
| % Males | 33.35 | 67.01 | 59.14 | 56.45 |
| Age (m, SD) | 15.47 (0.73) | 15.36 (0.73) | 15.54 (0.53) | 15.29 (0.67) |
| Past-year anxiety disorder symptoms (m, SD) | 6.19 (4.05) | 4.94 (3.78) | 5.84 (3.59) | 5.61(3.77) |
| Past-year mood disorder symptoms (m, SD) | 12.19 (7.77) | 10.29 (7.27) | 14.01 (6.68) | 12.36 (7.28) |
| Past-year externalizing disorder symptoms (m, SD) | 15.32 (8.94) | 15.57 (9.10) | 19.46 (9.26) | 17.27 (9.32) |
| %Past-year diagnosis for any mental health disorder | 25.00 | 26.37 | 33.90 | 29.43 |
| WRAT-4 Reading Standardized score (m, SD) | 107.19 (14.01) | 109.08 (16.96) | 105.53 (13.13) | 107.09 (14.75) |
| IGT total net (m, SD) | −1.51 (25.28) | 0.88 (21.73) | −1.02 (23.22) | −0.48 (23.12) |
| Amount of alcohol use in lifetime (drinks) (m, SD) | 36.08 (61.41) | 54.38 (107.79) | 126.41 (364.56) | 85.74 (257.46) |
| Amount of tobacco use in lifetime (cigarettes) (m, SD) | 3.69(11.51) | 16.94 (59.75) | 213.03 (1570.31) | 101.92 (1068.22) |
| Amount of cannabis use in lifetime (gr) (m, SD) | 2.48 (1.52) | 170.85 (384.89) | 315.41 (590.59) | 199.77 (470.17) |
| Age of cannabis use onset (m, SD) | 14.14 (0.81) | 13.42 (1.06) | 13.28 (1.48) | 13.50 (1.25) |
| Number of days since last cannabis use (Md, IQR) | 30 (61) | 7 (28) | 3 (20) | 14 (39) |
| Number of cannabis use problems (m, SD) | 2.49 (3.21) | 4.09 (3.70) | 5.09 (4.43) | 4.19 (4.07) |
| Number of years to co-use onset | 1.28 (1.29) | |||
| Number of DOTC used | 2.55 (1.64) | |||
Note: m = mean; SD = standard deviation; IGT = Iowa gambling task; Md = median; IQR: Interquartile Range; DOTC = drug(s) other than cannabis. Past-year anxiety disorders symptoms include any symptoms for panic disorder, generalized anxiety disorder and obsessive-compulsive disorder during the year prior to assessment based on the CDISC-IV. Past-year mood disorders symptoms include any symptoms for major depressive episode and maniac episode during the year prior to assessment based on the CDISC-IV. Past-year externalizing disorders symptoms include symptoms for attention deficit disorder, oppositional defiant disorder, and conduct disorder during the year prior to assessment based on the CDISC-IV.