Association between plain packaging (PP) phases and follow-up levels of quitting-related cognitions and behaviours—logistic regression results including baseline levels of each outcome variable in all models
| Weighted N | Pre-PP | Early transition | Late transition | PP year 1 | |||
|---|---|---|---|---|---|---|---|
| Daily thoughts about quitting in the past week† | 5079 | Unadjusted | % OR (95% CI) | 36.1 1.00 | 37.4 1.08 (0.77 to 1.53) | 36.8 1.04 (0.81 to 1.34) | 36.6 1.03 (0.86 to 1.23) |
| Adjusted | % OR (95% CI) | 33.2 1.00 | 36.2 1.20 (0.83 to 1.73) | 36.1 1.20 (0.89 to 1.60) | 38.2 1.36 (0.90 to 2.04) | ||
| Intend to quit in next month† | 5137 | Unadjusted | % OR (95% CI) | 34.8 1.00 | 35.5 1.04 (0.74 to 1.47) | 41.7** 1.50 (1.16 to 1.95) | 36.3 1.09 (0.92 to 1.30) |
| Adjusted | % OR (95% CI) | 36.1 1.00 | 36.5 1.03 (0.72 to 1.47) | 42.0* 1.42 (1.06 to 1.92) | 35.6 0.98 (0.64 to 1.48) | ||
| Firm date to quit in next month† | 5137 | Unadjusted | % OR (95% CI) | 8.4 1.00 | 7.1 0.82 (0.48 to 1.39) | 10.8 1.36 (0.92 to 2.02) | 6.6 0.76 (0.57 to 1.00) |
| Adjusted | % OR (95% CI) | 8.6 1.00 | 7.1 0.80 (0.46 to 1.39) | 11.0 1.35 (0.86 to 2.13) | 6.5 0.73 (0.36 to 1.47) | ||
| Concealed or covered pack several or many times in past month† | 5065 | Unadjusted | % OR (95% CI) | 16.1 1.00 | 17.9 1.18 (0.78 to 1.79) | 20.0* 1.42 (1.00 to 2.02) | 18.2 1.22 (0.97 to 1.53) |
| Adjusted | % OR (95% CI) | 14.3 1.00 | 16.0 1.19 (0.77 to 1.84) | 18.8* 1.55 (1.05 to 2.31) | 19.5* 1.65 (1.01 to 2.72) | ||
| Stubbed out several or many times in past month† | 5103 | Unadjusted | % OR (95% CI) | 24.3 1.00 | 23.1 0.92 (0.62 to 1.37) | 23.2 0.93 (0.70 to 1.23) | 26.9 1.18 (0.98 to 1.43) |
| Adjusted | % OR (95% CI) | 21.9 1.00 | 22.2 1.02 (0.68 to 1.54) | 22.5 1.04 (0.76 to 1.43) | 28.4* 1.55 (1.01 to 2.36) | ||
| Stopped from smoking several or many times in past month† | 5080 | Unadjusted | % OR (95% CI) | 36.8 1.00 | 44.7* 1.48 (1.08 to 2.03) | 39.3 1.14 (0.89 to 1.45) | 38.2 1.07 (0.91 to 1.26) |
| Adjusted | % OR (95% CI) | 36.7 1.00 | 44.9* 1.51 (1.08 to 2.10) | 39.4 1.15 (0.87 to 1.52) | 38.1 1.08 (0.74 to 1.57) | ||
| Attempted to quit in past month‡ | 5411 | Unadjusted | % OR (95% CI) | 23.6 1.00 | 28.3 1.32 (0.94 to 1.85) | 18.7* 0.71 (0.54 to 0.95) | 24.1 1.03 (0.86 to 1.23) |
| Adjusted | % OR (95% CI) | 20.2 1.00 | 25.5* 1.43 (1.00 to 2.03) | 17.4 0.81 (0.58 to 1.12) | 26.6* 1.52 (1.01 to 2.30) | ||
Unadjusted=unadjusted for covariates, adjustment for baseline level of each outcome variable was retained for comparability with adjusted findings. Adjusted=adjusted for baseline level of each outcome variable and covariates: date of the follow-up survey; number of days between baseline and follow-up survey; cumulative Target Audience Rating Points (antismoking television advertising) in the 3 months prior to the follow-up survey; change in cigarette costliness (based on month of follow-up survey); sex; age; education; socioeconomic status; and Heaviness of Smoking Index.
*p<0.05, **p<0.01.
†Eligible sample limited to respondents who were cigarette smokers at baseline and at follow-up.
‡Eligible sample limited to respondents who were cigarette smokers at baseline (ie, either still smoking or not smoking at follow-up).