Table 2. Final model relating 12 predictor variables to ever e-cigarette use at Wave 1.
The table shows the final model used for the propensity score. It is based on those 12 of the 18 predictor variables which entered stage 3 and is based on data from those 10,671 youth with data on all the 12 predictors.
| Variable a | Levels | N | OR (95% CI) |
|---|---|---|---|
| Age range | 12–14 | 5738 | 1.000 (base) |
| 15–17 | 4933 | 1.949 (1.557-2.440) | |
| Ever used alcohol at all | Yes | 3441 | 1.000 (base) |
| No | 7230 | 0.401 (0.319-0.504) | |
| Ever been curious about smoking a cigarette | 0.639 (0.556-0.734)) b | ||
| Think you will smoke a cigarette in the next year | 0.486 (0.393-0.600) c | ||
| Agree/disagree: Prefer friends who are | Strongly agree | 716 | 1.000 (base) |
| exciting and unpredictable | Agree | 2578 | 0.838 (0.602-1.168) |
| Neither agree nor disagree | 3818 | 0.604 (0.432-0.846) | |
| Disagree | 2062 | 0.345 (0.220-0.542) | |
| Strongly disagree | 1497 | 0.708 (0.439-1.143) | |
| Reaction if parent/guardian found you | Be very upset | 10255 | 1.000 (base) |
| using tobacco | Not be too upset | 314 | 1.986 (0.383-2.853) |
| Have no reaction | 102 | 1.717 (0.798-3.693) | |
| Gender | Male | 5395 | 1.000 (base) |
| Female | 5216 | 0.660 (0.535-0.813) | |
| Agree/disagree; I think I would enjoy | Strongly agree | 25 | 1.000 (base) |
| using tobacco | Agree | 164 | 6.720 (1.317-34.28) |
| Disagree | 2136 | 5.002 (1.011-24.74) | |
| Strongly disagree | 8346 | 3.798 (0.760-18.98) | |
| Agree/disagree: some products are | Strongly agree | 332 | 1.000 (base) |
| safer than others | Agree | 2621 | 0.514 (0.358-0.738) |
| Neither agree nor disagree | 2192 | 0.515 (0.347-0.764) | |
| Disagree | 2317 | 0.348 (0.225-0.538) | |
| Strongly disagree | 3209 | 0.354 (0.230-0.544) | |
| Ever used prescription drug not | Yes | 132 | 1.000 (base) |
| prescribed to you: Ritalin or Adderall | No | 10539 | 0.323 (0.198-0.528) |
| Has a Facebook, Google Plus, | Yes | 8909 | 1.000 (base) |
| MySpace, Twitter or other social networking | No | 1762 | 0.468 (0.299-0.733) |
| Anyone who lives with you now use | Cigarettes, cigars, | 2929 | 1.000 (base) |
| Tobacco | cigarillos, filtered cigars | ||
| Smokeless or other | 456 | 1.389 (0.924-2.088) | |
| tobacco | |||
| No one living in the home | 7286 | 0.741 (0.594-0.925) | |
| uses tobacco |
aThe variables are shown in order of their inclusion into the model
bOdds ratio are per unit of the graded variable which represents decreasing curiosity
cOdds ratio are per unit of the graded variable which represents decreasing likelihood