Table 1. Descriptive Characteristics.
| Variable | Participants (N = 3322)a |
| Age at baseline, mean (SD), y | 16.50 (0.42) |
| Highest parental educational level | |
| College degree or higher | 2014 (60.6) |
| Some college or less | 856 (25.8) |
| Gender | |
| Female | 1777 (53.5) |
| Male | 1544 (46.5) |
| Race/ethnicity | |
| American Indian or Alaska Native | 34 (1.0) |
| Asian | 551 (16.6) |
| Black | 161 (4.8) |
| Hispanic or Latino | 1573 (47.4) |
| Native Hawaiian or Pacific Islander | 138 (4.2) |
| White | 533 (16.0) |
| Multiracial | 216 (6.5) |
| Other | 49 (1.5) |
| Unknown | 67 (2.0) |
| Nicotine vaping, any past 30-d use | |
| Wave 5 | |
| No/total No. (%) | 183/3188 (5.7) |
| Mean (SD), d | 8.50 (9.72) |
| Wave 6 | |
| No/total No. (%) | 167/3065 (5.4) |
| Mean (SD), d | 8.53 (9.20) |
| Wave 7 | |
| No/total No. (%) | 139/3143 (4.4) |
| Mean (SD), d | 8.65 (10.04) |
| Wave 8 | |
| No/total No. (%) | 232/3109 (7.5) |
| Mean (SD), d | 9.38 (10.01) |
| Wave 9 | |
| No/total No. (%) | 547/2483 (22.0) |
| Mean (SD), d | 11.34 (11.18) |
| Cannabis vaping, any past 30-d use | |
| Wave 5 | |
| No/total No. (%) | 134/3188 (4.2) |
| Mean (SD), d | 8.87 (9.37) |
| Wave 6 | |
| No/total No. (%) | 137/3065 (4.7) |
| Mean (SD), d | 8.96 (9.18) |
| Wave 7 | |
| No/total No. (%) | 176/3143 (5.6) |
| Mean (SD), d | 8.93 (9.68) |
| Wave 8 | |
| No/total No. (%) | 306/3109 (9.8) |
| Mean (SD), d | 8.61 (9.05) |
| Wave 9 | |
| No/total No. (%) | 599/2483 (24.1) |
| Mean (SD), d | 9.78 (9.58) |
a
Data are presented as number (percentage) of participants unless otherwise indicated. Baseline was wave 5, fall of 11th grade; wave 6, spring of 11th grade; wave 7, fall of 12th grade; wave 8, spring of 12th grade; and wave 9, young adulthood.