Perceptions of tobacco brands among adolescent smokers before and 1 year after the implementation of plain tobacco packaging. Description des Perceptions, Images, et Comportements liés au Tabagisme (DePICT) Study, France, 2016–2017, n=403, adjusted prevalence ratios
| Outcome | Prevalence ratio 2017 vs 2016* | P values* |
| Attachment to a tobacco brand (high vs intermediate/low) | 0.47 (0.30 to 0.73) | 0.0009 |
| Positive opinion of tobacco brand’s name (high vs intermediate/low) | 0.73 (0.62 to 0.86) | 0.0002 |
| Perception of low tobacco brand’s harmfulness compared with others (yes vs no) | 0.47 (0.32 to 0.70) | 0.0002 |
*Adjusted for age, sex, schooling characteristics and parental smoking.