Table 1.
Prevalence of Past 12-month Vaping for the Study Sample When Assessed in 2017, 2018, and 2019 (n = 2018). Percentages and 95% Confidence Intervals
| T1 (mean age 14.2) | T2 (mean age 15.2) | T3 (mean age 16.2) | ||||
|---|---|---|---|---|---|---|
| n | % (95% CI) | N | % (95% CI) | n | % (95% CI) | |
| Non-users | 1785 | 88.4 (87.0–89.8) | 1765 | 87.5 (85.9–88.8) | 1726 | 85.5 (83.9–87.0) |
| Use with nicotine | 52 | 2.6 (2.0–3.4) | 96 | 4.8 (3.9–5.8) | 147 | 7.3 (6.2–8.5) |
| Use without nicotine | 154 | 7.6 (6.6–8.9) | 138 | 6.8 (5.8–8.0) | 123 | 6.1 (5.1–7.2) |
| Unsure of nicotine content | 27 | 1.3 (0.9–1.9) | 19 | 0.9 (0.6–1.5) | 22 | 1.1 (0.7–1.7) |
| Total | 2018 | 100 | 2018 | 100 | 2018 | 100 |