Table 2. Percentage of 10th- and 12th-Grade Students Who Vaped Nicotine in the Past 30 Days and Reported Getting Selected Vaping Materials Would Be Fairly Easy or Very Easy, by Year.
| Variable | Students, % (95% CI) | ||
|---|---|---|---|
| Vaping device | Nicotine solution for vaping | Flavored nicotine solution | |
| 2017 | 93.7 (91.2 to 95.4) | 94.6 (92.1 to 96.3) | NA |
| 2018 | 94.5 (92.6 to 95.9) | 93.7 (91.7 to 95.2) | NA |
| 2019 | 93.0 (91.1 to 94.5) | 92.1 (90.0 to 93.8) | NA |
| 2020 | 86.4 (82.7 to 89.3)a | 83.0 (78.5 to 86.7)a | 79.8 (74.9 to 83.9) |
| Logistic regression results for predicted valuesb | |||
| Year | 0.4 (−0.1 to 0.9) | 0.2 (−0.3 to 0.7) | NA |
| Year2 | −0.2 (−0.4 to −0.1) | −0.2 (−0.4 to −0.1) | NA |
| Constant | 2.7 (2.3 to 3.0) | 2.8 (2.4 to 3.2) | NA |
Abbreviation: NA, not applicable.
a
Prevalence level significantly different from previous year at P < .05 for a 2-tailed test.
b
Year is centered at 2017 and coefficients are unexponentiated. All curvature coefficients (Year2) are statistically significant at P < .05 for a 2-tailed test, as indicated by 95% CIs that do not include 0.