Table 1.
Demographics of Participants
| All (N=105) | Cannabis users (N=58) | Healthy controls (N=47) | |
|---|---|---|---|
| Males n (%) | 67 (64) | 41 (71) | 26 (55) |
| Age—mean (SD) | 29.74 (8.73) | 29.62 (7.52) | 29.89 (10.12) |
| Age of onset of regular cannabis use mean (SD) | — | 16.96 (11.43) | — |
| Education in years mean (SD) | 14.50 (2.40) | 13.45 (2.26) | 15.79 (1.89) |
| Race | |||
| Caucasian | 55 | 33 | 22 |
| African American | 21 | 13 | 8 |
| American Indian/Alaska Native | 3 | 0 | 2 |
| Asian | 10 | 4 | 9 |
| Native Hawaiian or Pacific Islander | 1 | 0 | 1 |
| Multiracial | 10 | 8 | 2 |
| Other | 6 | 3 | 3 |
| Lifetime cannabis problem symptom countb | — | 1.22 (2.32) | — |
| Current cannabis problem symptom countb | — | 1.19 (2.32) | — |
| Rs2023239 Genotype | GG: 3 | GG: 3 | GG: 0 |
| GA: 18 | GA: 14 | GA: 4 | |
| AA: 51 | AA: 27 | AA: 24 | |
| 33 NA | 14 NA | 19 NAs | |
From the Structured Clinical Interview for DSM-IV.
SD, standard deviation.