Unadjusted and adjusted percentages, ORs and 95% CIs from logistic regression models predicting perceived harm outcomes*
| Comparing phases—unadjusted models | Comparing phases—adjusted models† | PP year 1 trend—adjusted models | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Per cent | OR (95% CI) | p Value | Per cent | OR (95% CI) | p Value | Form | OR | p Value | |
| Believes brands do not differ in harmfulness‡ (n=6924) | |||||||||
| Pre-PP | 65.8 | 1.00 | 65.7 | 1.00 | |||||
| Transition | 67.0 | 1.06 (0.86 to 1.29) | 0.598 | 67.6 | 1.09 (0.89 to 1.35) | 0.405 | |||
| PP year 1 | 69.8 | 1.20 (1.06 to 1.36) | 0.004 | 69.8 | 1.21 (1.06 to 1.38) | 0.004 | Linear | 0.97 | 0.012 |
| Higher harmfulness than a year ago§ (n=6838) | |||||||||
| Pre-PP | 24.2 | 1.00 | 23.8 | 1.00 | |||||
| Transition | 22.1 | 0.89 (0.70 to 1.12) | 0.323 | 21.8 | 0.89 (0.70 to 1.13) | 0.349 | |||
| PP year 1 | 23.4 | 0.96 (0.83 to 1.10) | 0.532 | 23.6 | 0.99 (0.86 to 1.14) | 0.877 | Linear | 1.00 | 0.811 |
| Believes variants do not differ in strength‡ (n=6894) | |||||||||
| Pre-PP | 5.2 | 1.00 | 5.3 | 1.00 | |||||
| Transition | 5.9 | 1.16 (0.78 to 1.72) | 0.477 | 5.8 | 1.09 (0.72 to 1.64) | 0.683 | |||
| PP year 1 | 6.1 | 1.19 (0.92 to 1.55) | 0.178 | 6.1 | 1.15 (0.88 to 1.51) | 0.303 | Linear | 1.01 | 0.812 |
Bold text indicates significant findings at p<0.05.
*Valid n's for each model vary because of differences in the number of respondents who were eligible for each question (see below) and the number of missing cases for each outcome. Missing cases ranged from 5.4% to 6.6%.
†Multivariate models adjusted for age, gender, educational attainment, SES, Heaviness of Smoking Index, past 3-month Target Audience Rating Points for antismoking mass media campaigns and change in cigarette costliness.
‡Items were only asked of cigarette smokers who, when asked to name which brand of FM cigarettes/RYO tobacco they were currently smoking, provided a valid brand name.
§Items were asked of all cigarette smokers.
FM, factory-made; PP, plain packaging; RYO, roll-your-own; SES, socioeconomic status.