Summary of multilevel model analyses of study-dependent variables as a function of e-cigarette flavour assigned, over weeks
| Dependent variable | Effect tested | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cigs/day baseline (df=1, 3143) | Week# (df=6, 3143) | Day# (df=6, 3143) | Week# × Day# (df=36, 3143) | Flavour assigned (df=3, 3143) | Menthol smoker (df=1, 3143) | Nicotine e-cigarette (df=1, 3143) | Flavour × Week# (df=18, 3143) | Flavour × menthol (df=3, 3143) | Flavour × nicotine (df=33 143) | |
| Cigarettes/day | 672.98*** | 109.59*** | 0.52 | 0.84 | 2.23 | 34.48*** | 95.44*** | 1.73* | 22.81*** | 1.75 |
| e-Cigarettes/day | 31.41*** | 52.78*** | 0.46 | 0.33 | 13.70*** | 6.97** | 25.84*** | 1.13 | 7.03*** | 54.71*** |
| CO levelsa | 323.74*** | 18.82*** | – | – | 36.72*** | 125.54*** | 77.30*** | 4.68*** | 41.09*** | 20.53*** |
Values shown are F-values. *p<0.05, **p<0.01, ***p<0.001.–, Effect not measured on this dependent variable; df, degrees of freedom.
aDenominator df for this dependent variable=2874.