| B | |||||
| E-cigarette adverts (n=521) | Control adverts (n=536) | Test statistic | P values | Total (n=1057) | |
| Age—M (SD) | 13.46 (1.40) | 13.50 (1.34) | 0.472 | 0.637 | 13.48 (1.37) |
| Gender—male % (n) | 45.1 (235) | 48.7 (261) | 3.147 | 0.076 | 46.9 (496) |
| Ethnicity—White % (n) | 74.9 (390) | 73.1 (392) | 0.407 | 0.524 | 74.0 (782) |
For all variables reported above, differences between the experimental groups were examined using χ2 tests, apart from the age variable which was examined using an independent samples t-test.