Skip to main content
. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Tob Control. 2016 Jan 25;26(1):34–39. doi: 10.1136/tobaccocontrol-2015-052705

Table 3.

Probability of smoking onset (ever use) at T2 among T1 never-smokers as a function of level of e-cigarette use at T1, with ORs and 95% CIs

Level of T1 e-cigarette
use		 Per cent
(onset)		 OR CI p Value
Never 5 1.00
1–2 times 14 2.88 1.96 to 4.22 <0.0001
3–4 times 11 2.29 1.35 to 3.87 0.002
Yearly/monthly 19 4.17 2.03 to 8.57 0.0001
Weekly/daily 19 4.09 2.43 to 6.88 <0.0001

Analysis conducted for T1 never-smokers, analytic N=1070. Criterion variable is never smoked versus ever smoked at T2. Cells for the highest levels of use are collapsed to avoid small cell sizes. Results are adjusted for demographics, parenting and personality variables, and for clustering within school.