Table 1.
Demographic and study variable characteristics of the V‐HYS (T1 n = 662).
| Mean (SD) or n (%) | |
|---|---|
| Demographics (time 1) | |
| Sex (% female) | 342 (52%) |
| Age | 15.52 (1.92) |
| SESa | 2.88 (1.38) |
| Ethnicity (% white) | 561 (85%) |
| Time 1 | |
| Covariates | |
| Cigarette use | 75 (11%) |
| Heavy episodic drinking (HED) | 0.60 (1.00) |
| Predictors | |
| Cannabis use (CU) frequency (average) | 0.73 (1.21) |
| Never | 426 (64%) |
| A few times a year | 109 (17%) |
| A few times per month | 60 (9%) |
| Once a week | 15 (2%) |
| More than once a week | 52 (8%) |
| Cannabis use disorder (CUD) | –b |
| Outcomes | |
| Psychotic symptoms | –c |
| Depressive symptoms | 2.79 (2.53) |
| Anxiety symptoms | 5.81 (2.58) |
| Time 2 | |
| Covariates | |
| Cigarette use | 107 (19%) |
| Heavy episodic drinking (HED) | 1.14 (1.24) |
| Predictors | |
| Cannabis use (CU) frequency (average) | 1.17 (1.45) |
| Never | 277 (48%) |
| A few times a year | 113 (20%) |
| A few times per month | 74 (13%) |
| Once a week | 22 (4%) |
| More than once a week | 86 (15%) |
| Cannabis use disorder (CUD) | –b |
| Outcomes | |
| Psychotic symptoms | –c |
| Depressive symptoms | 3.19 (2.57) |
| Anxiety symptoms | 6.24 (2.62) |
| Time 3 | |
| Covariates | |
| Cigarette use | 131 (25%) |
| Heavy episodic drinking (HED) | 1.55 (1.29) |
| Predictors | |
| Cannabis use (CU) frequency (average) | 1.45 (1.54) |
| Never | 207 (39%) |
| A few times a year | 128 (24%) |
| A few times per month | 54 (10%) |
| Once a week | 38 (7%) |
| More than once a week | 105 (20%) |
| Cannabis use disorder (CUD) | –b |
| Outcomes | |
| Psychotic symptoms | 3.34 (2.54) |
| Depressive symptoms | 3.60 (2.66) |
| Anxiety symptoms | 6.26 (2.51) |
| Time 4 | |
| Covariates | |
| Cigarette use | 123 (27%) |
| Heavy episodic drinking (HED) | 1.62 (1.28) |
| Predictors | |
| Cannabis use (CU) frequency (average) | 1.40 (1.56) |
| Never | 191 (42%) |
| A few times a year | 97 (22%) |
| A few times per month | 48 (11%) |
| Once a week | 20 (4%) |
| More than once a week | 95 (21%) |
| Cannabis use disorder (CUD) | 116 (26%) |
| Outcomes | |
| Psychotic symptoms | 2.69 (2.37) |
| Depressive symptoms | 3.07 (2.62) |
| Anxiety symptoms | 5.98 (2.63) |
| Time 5 | |
| Covariates | |
| Cigarette use | 127 (28%) |
| Heavy episodic drinking (HED) | 1.52 (1.21) |
| Predictors | |
| Cannabis use (CU) frequency (average) | 1.21 (1.46) |
| Never | 206 (46%) |
| A few times a year | 113 (25%) |
| A few times per month | 39 (9%) |
| Once a week | 24 (5%) |
| More than once a week | 71 (16%) |
| Cannabis use disorder (CUD) | 79 (17%) |
| Outcomes | |
| Psychotic symptoms | 2.41 (2.27) |
| Depressive symptoms | 2.88 (2.58) |
| Anxiety symptoms | 5.61 (2.67) |
| Time 6 | |
| Covariates | |
| Cigarette use | 106 (22%) |
| Heavy episodic drinking (HED) | 1.44 (1.21) |
| Predictors | |
| Cannabis use (CU) frequency (average) | 1.22 (1.47) |
| Never | 214 (45%) |
| A few times a year | 116 (25%) |
| A few times per month | 41 (9%) |
| Once a week | 24 (5%) |
| More than once a week | 77 (16%) |
| Cannabis use disorder (CUD) | 73 (16%) |
| Outcomes | |
| Psychotic symptoms | 2.24 (2.34) |
| Depressive symptoms | 2.88 (2.65) |
| Anxiety symptoms | 5.44 (2.78) |
a
Socio‐economic status (SES) was assessed by mother's level of education (0 = did not finish high school to 4 = finished college/university) in the Victoria Healthy Youth Survey (V‐HYS). SD = standard deviation.
b
CUD was not assessed until T4 (2009) in the V‐HYS.
c
Psychotic symptoms were not assessed until T3 (2007) in the V‐HYS.