Association of baseline measures with missingness (1=absent) at follow-up for baseline never used cigarettes (n=2196; left-hand column) and baseline once or used to use cigarettes (n=497; right-hand column)
| Predictors | Baseline never used cigarettes | Baseline once or used to use cigarettes | ||
| OR (95% CI) | p Value | OR (95% CI) | p Value | |
| Never used e-cigarettes | 1.00 | 1.00 | ||
| Ever used e-cigarettes | 1.11 (0.85 to 1.46) | 0.43 | 0.83 (0.51 to 1.35) | 0.44 |
| Friend smokers= none | 1.00 | 1.00 | ||
| Friend smokers=a few | 1.18 (0.93 to 1.49) | 0.18 | 2.08 (1.12 to 3.82) | 0.019 |
| Friend smokers= most | 1.36 (0.78 to 2.39) | 0.28 | 4.33 (2.10 to 8.95) | <0.001 |
| Male | 1.00 | 1.00 | ||
| Female | 0.70 (0.56 to 0.86) | <0.001 | 0.84 (0.6 to 1.26) | 0.40 |
| Family smokers = none | 1.00 | 1.00 | ||
| Family smokers = one | 1.29 (0.99 to 1.67) | 0.057 | 0.90 (0.47 to 1.71) | 0.74 |
| Family smokers = two | 1.10 (0.79 to 1.51) | 0.58 | 0.97 (0.50 to 1.89) | 0.93 |
| Family smokers = three or more | 1.53 (1.10 to 2.12) | 0.01 | 0.81 (0.43 to 1.53) | 0.51 |
| Intentions | 0.77 (0.62 to 0.96) | 0.02 | 0.99 (0.71 to 1.38) | 0.95 |
| Attitudes | 0.93 (0.65 to 1.31) | 0.66 | 1.29 (0.86 to 1.93) | 0.22 |
| Norms | 0.95 (0.66 to 1.37) | 0.78 | 0.99 (0.65 to 1.52) | 0.97 |
| Perceived behavioural control | 0.91 (0.73 to 1.14) | 0.42 | 0.64 (0.46 to 0.88) | 0.006 |
| Self-efficacy | 1.25 (0.95 to 1.64) | 0.11 | 1.15 (0.79 to 1.67) | 0.46 |
| Free school meals | 1.03 (0.97 to 1.08) | 0.34 | 1.01 (0.97 to 1.06) | 0.49 |
Baseline never used cigarettes, AIC=2222.6; baseline once or used to use cigarettes, AIC=658.7.