Table 1.
Participant Characteristics
|
Baseline
(n=1108) |
6 months
(n=1052) |
15 months
(n=1037) |
2 years
(n=1061) |
5 years
(n=1027) |
6 years
(n=1064) |
|
|---|---|---|---|---|---|---|
| Demographics | ||||||
| Age | 15.63 (0.61) | 16.14 (0.62) | 16.89 (0.62) | 17.59 (0.60) | 21.38 (0.81) | 22.40 (0.83) |
| Gender (% female) | 58% | 58% | 59% | 59% | 59% | 59% |
| Years of Education | 9.49 (0.50) | 10.47 (0.52) | 11.14 (0.73) | 11.46 (0.55) | 13.11 (1.05) | 13.59 (1.42) |
| Ethnicity/Race | ||||||
| Caucasian | 57% | 57% | 57% | 57% | 58% | 57% |
| Black | 17% | 17% | 17% | 17% | 17% | 17% |
| Hispanic | 17% | 16% | 16% | 16% | 16% | 16% |
| Asian | 4% | 4% | 4% | 4% | 4% | 4% |
| Other | 5% | 6% | 6% | 6% | 5% | 6% |
| CES-D Total Score | ||||||
| Males | 14.32 (8.65) | 14.25 (8.72) | 13.52 (8.90) | 13.43 (9.05) | 12.96 (9.89) | 12.26 (9.50) |
| Females | 18.84 (10.32) | 17.93 (10.49) | 15.37 (9.38) | 16.15 (9.62) | 13.74 (9.82) | 13.14 (9.82) |
| Substance Use | ||||||
| Frequency of marijuana use in past month (days) | ||||||
| Males | 2.71 (6.27) | 3.23 (6.93) | 3.85 (7.55) | 5.24 (8.75) | 6.81 (9.91) | 7.14 (10.23) |
| Females | 1.51 (4.06) | 1.92 (4.92) | 2.24 (5.73) | 2.84 (6.34) | 4.34 (8.05) | 3.89 (7.83) |
| Marijuana-Related Problems (CUDIT-R) | ||||||
| Males | -- | -- | -- | -- | 7.73 (8.08) | 7.09 (7.42) |
| Females | -- | -- | -- | -- | 4.66 (6.38) | 4.27 (6.04) |
| Frequency of cigarette use in past month (days) | ||||||
| Males | 4.01 (7.80) | 4.97 (8.87) | 6.33 (10.52) | 7.48 (11.16) | 12.73 (13.23) | 12.31 (12.93) |
| Females | 3.88 (7.85) | 4.38 (8.38) | 5.26 (9.65) | 5.94 (10.23) | 9.31 (12.12) | 8.47 (12.22) |
| Nicotine Dependence (mFTQ) | ||||||
| Males | 1.41 (1.18) | 1.63 (1.39) | 1.79 (1.49) | 1.87 (1.53) | 2.78 (1.65) | 2.85 (1.63) |
| Females | 1.41 (1.22) | 1.42 (1.31) | 1.57 (1.39) | 1.62 (1.39) | 2.40 (1.40) | 2.51 (1.53) |
Note: all values are means or standard deviations unless otherwise noted; CES-D, Center for Epidemiological Scale-Depression; CUDIT-R, Cannabis Use Disorders Identification Test-Revised; mFTQ, modified Fagerstrom Questionnaire.