Variable | 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 | |
Notices GHW first when looking at pack‡ (n=7007) | |||||||||
Pre-PP | 34.4 | 1.00 | 34.0 | 1.00 | |||||
Transition | 44.9 | 1.55 (1.29 to 1.88) | <0.001 | 44.9 | 1.60 (1.32 to 1.95) | <0.001 | |||
PP year 1 | 67.5 | 3.96 (3.51 to 4.48) | <0.001 | 67.7 | 4.26 (3.74 to 4.85) | <0.001 | Linear | 1.00 | 0.844 |
Does not believe dangers of smoking are exaggerated‡ (n=7163) | |||||||||
Pre-PP | 65.6 | 1.00 | 65.1 | 1.00 | |||||
Transition | 65.7 | 1.00 (0.83 to 1.22) | 0.969 | 65.7 | 1.03 (0.84 to 1.25) | 0.788 | |||
PP year 1 | 63.8 | 0.92 (0.82 to 1.04) | 0.194 | 64.0 | 0.96 (0.84 to 1.08) | 0.470 | Linear | 1.25 | 0.028 |
Quad | 0.99 | 0.021 | |||||||
Attributes much more motivation to quit to GHWs‡ (n=7123) | |||||||||
Pre-PP | 9.4 | 1.00 | 9.3 | 1.00 | |||||
Transition | 11.8 | 1.28 (0.96 to 1.72) | 0.097 | 11.6 | 1.29 (0.95 to 1.75) | 0.101 | |||
PP year 1 | 13.3 | 1.47 (1.21 to 1.77) | <0.001 | 13.4 | 1.52 (1.25 to 1.86) | <0.001 | Linear | 0.96 | 0.013 |
Concealed pack in past month‡ (n=7096) | |||||||||
Pre-PP | 17.3 | 1.00 | 17.1 | 1.00 | |||||
Transition | 19.0 | 1.12 (0.89 to 1.42) | 0.325 | 19.1 | 1.15 (0.90 to 1.46) | 0.252 | |||
PP year 1 | 23.1 | 1.44 (1.24 to 1.66) | <0.001 | 23.1 | 1.47 (1.26 to 1.71) | <0.001 | Linear | 0.99 | 0.533 |
Requested different GHW in past month‡ (n=7126) | |||||||||
Pre-PP | 3.9 | 1.00 | 3.9 | 1.00 | |||||
Transition | 8.2 | 2.19 (1.47 to 3.28) | <0.001 | 8.5 | 2.28 (1.52 to 3.44) | <0.001 | |||
PP year 1 | 9.2 | 2.48 (1.90 to 3.24) | <0.001 | 9.1 | 2.49 (1.89 to 3.29) | <0.001 | Linear | 0.99 | 0.756 |
Bold text indicates significant findings at p<0.05.
*Valid n's for each model vary because of the number of missing cases for each outcome. Missing cases ranged from 2.2% to 4.3%.
†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 asked of all cigarette smokers.
GHW, graphic health warning; PP, plain packaging; SES, socioeconomic status.