Multivariable logistic regression of relationship between smoking onset by T2 and demographics, T1 e-cigarette use, T1 smoking propensity, and interaction between T1 e-cigarette use and smoking propensity
| T1 predictor | Estimate | SE | LCL | UCL | t | p Value |
|---|---|---|---|---|---|---|
| Gender (male) | 0.00 | 0.09 | −0.19 | 0.19 | 0.00 | 0.99 |
| Ethnicity, Caucasian | 1.53 | 0.24 | 1.06 | 1.99 | 6.46 | <0.0001 |
| Ethnicity, Filipino | 0.91 | 0.367 | 0.18 | 1.64 | 2.46 | 0.01 |
| Ethnicity, Native Hawaiian | 1.37 | 0.36 | 0.67 | 2.07 | 3.82 | <0.0001 |
| Ethnicity, other | 1.23 | 0.33 | 0.59 | 1.87 | 3.76 | 0.0001 |
| Father's education | −0.08 | 0.27 | −0.61 | 0.45 | −0.31 | 0.44 |
| E-cigarette use | 0.80 | 0.18 | 0.45 | 1.15 | 4.46 | <0.0001 |
| Propensity to smoke | 0.39 | 0.13 | 0.12 | 0.65 | 2.89 | <0.01 |
| E-cigarette use×propensity | −0.13 | 0.05 | −0.23 | −0.03 | 2.50 | 0.01 |
Analysis based on T1 never-smokers.
Analytic n=1136.
LCL, lower confidence limit; UCL, upper confidence limit.