Sample Characteristics
| Characteristic . | Wave 1 . | Wave 2 . | ||
|---|---|---|---|---|
| Overall Sample (N = 13 651), n (%) . | Past 30-d Regular E-cigarette Users (N = 281), n (%) . | Overall Sample (N = 12 172), n (%) . | Past 30-d Regular E-cigarette Users (N = 330), n (%) . | |
| Age, y | ||||
| 12–14 | 6997 (50.4) | 46 (15.3) | 6266 (50.7) | 67 (19.2) |
| 15–17 | 6653 (49.6) | 235 (84.7) | 5906 (49.3) | 263 (80.8) |
| Sex | ||||
| Male | 6993 (51.3) | 182 (65.4) | 6225 (51.3) | 201 (60.0) |
| Female | 6657 (48.7) | 99 (34.6) | 5918 (48.7) | 129 (40.0) |
| Race or ethnic group | ||||
| Non-Hispanic white | 9471 (70.7) | 219 (80.3) | 7832 (69.7) | 254 (82.9) |
| Non-Hispanic African American | 2086 (15.2) | 19 (6.6) | 1826 (15.7) | 13 (4.6) |
| Other | 2093 (14.1) | 43 (13.1) | 1823 (14.6) | 50 (12.5) |
| Cigarette smoker | ||||
| Current smoker | 634 (4.6) | 148 (49.4) | 481 (4.0) | 149 (44.1) |
| Ever smoker | 1186 (8.7) | 78 (30.7) | 938 (7.7) | 84 (25.7) |
| Nonsmoker | 11 792 (86.7) | 54 (19.8) | 10 720 (88.4) | 95 (30.2) |
| Characteristic . | Wave 1 . | Wave 2 . | ||
|---|---|---|---|---|
| Overall Sample (N = 13 651), n (%) . | Past 30-d Regular E-cigarette Users (N = 281), n (%) . | Overall Sample (N = 12 172), n (%) . | Past 30-d Regular E-cigarette Users (N = 330), n (%) . | |
| Age, y | ||||
| 12–14 | 6997 (50.4) | 46 (15.3) | 6266 (50.7) | 67 (19.2) |
| 15–17 | 6653 (49.6) | 235 (84.7) | 5906 (49.3) | 263 (80.8) |
| Sex | ||||
| Male | 6993 (51.3) | 182 (65.4) | 6225 (51.3) | 201 (60.0) |
| Female | 6657 (48.7) | 99 (34.6) | 5918 (48.7) | 129 (40.0) |
| Race or ethnic group | ||||
| Non-Hispanic white | 9471 (70.7) | 219 (80.3) | 7832 (69.7) | 254 (82.9) |
| Non-Hispanic African American | 2086 (15.2) | 19 (6.6) | 1826 (15.7) | 13 (4.6) |
| Other | 2093 (14.1) | 43 (13.1) | 1823 (14.6) | 50 (12.5) |
| Cigarette smoker | ||||
| Current smoker | 634 (4.6) | 148 (49.4) | 481 (4.0) | 149 (44.1) |
| Ever smoker | 1186 (8.7) | 78 (30.7) | 938 (7.7) | 84 (25.7) |
| Nonsmoker | 11 792 (86.7) | 54 (19.8) | 10 720 (88.4) | 95 (30.2) |