Table 3.
Descriptive Statistics for Persistent Non-Usersa and Non-Users at Baseline (T1) Who Later Initiated Vaping With or Without Nicotine. Percentages and Means With 95% Confidence Intervals
| Non-users at T1, T2, and T3 (n = 1501) | Used e-cigarettes with nicotine at T2 and/or T3 (n = 128) | Used e-cigarettes without nicotine at T2 and/or T3 (n = 133) | |
|---|---|---|---|
| %/Mean (95% CI) | %/Mean (95% CI) | %/Mean (95% CI) | |
| Variables measured at T1 | |||
| Gender (male) | 38.4 (35.9–40.9) | 40.6 (32.5–49.3) | 51.1 (42.7–59.5) |
| Age | 14.13 (14.08–14.17) | 14.17 (14.02–14.32) | 14.02 (13.89–14.16) |
| Sensation-seeking | 2.78 (2.73–2.84) | 3.29 (3.09–4.50) | 3.16 (2.99–3.33) |
| Conduct problems | 0.51 (0.46–0.57) | 1.33 (1.01–1.65) | 0.92 (0.66–1.19) |
| Depression | 5.14 (4.88–5.40) | 7.01 (6.01–8.00) | 5.71 (4.81–6.62) |
| Snus | |||
| Used in the last 12 months | 1.7 (1.2–2.5) | 11.7 (7.2–18.5) | 3.8 (1.6–8.7) |
| Used in the last 30 days | 0.1 (0.0–1.1) | 5.5 (2.6–11.0) | 1.5 (0.4–5.8) |
| Cigarettes | |||
| Used in the last 12 months | 1.2 (0.8–1.9) | 6.3 (3.2–12.0) | 3.8 (1.6–8.7) |
| Used in the last 30 daysb | 0.3 (0.1–0.7) | 4.7 (2.1–10.0) | 1.5 (0.4–5.8) |
aE-cigarette users at T1 are not included.
bEstimates in italics are based on fewer than five observations.