Unadjusted mean scores (SEs) on positive and negative pack image ratings for 2011 and 2013 students by smoking status for students who have seen a pack in previous 6 months (weighted data)
| Year | F-statistics and p values* | |||||||
|---|---|---|---|---|---|---|---|---|
| NSNS Mean (SE) | SNS Mean (SE) | Triers Mean (SE) | MS Mean (SE) | Total Mean (SE) | Year | Smoking status | Interaction: year and smoking status | |
| Negative image† | ||||||||
| 2011 | 4.18 (0.02) | 3.87 (0.04) | 3.80 (0.03) | 3.28 (0.04) | 3.96 (0.02) | F(1,184)=28.80 p<0.001 | F(3,182)=158.83 p<0.001 | F(3,182)=1.01 p=0.39 |
| 2013 | 4.31 (0.02) | 4.00 (0.04) | 3.93 (0.04) | 3.41 (0.04) | 4.15 (0.02) | |||
| Positive image† | ||||||||
| 2011 | 1.47 (0.02) | 1.88 (0.03) | 1.90 (0.03) | 2.46 (0.05) | 1.72 (0.02) | F(1,184)=40.26 p<0.001 | F(3,182)=160.57 p<0.001 | F(3,182)=3.92 p=0.01 |
| 2013 | 1.34 (0.02) | 1.75 (0.04) | 1.77 (0.03) | 2.33 (0.05) | 1.52 (0.02) | |||
Ninety-four students had missing data on the smoking status variable and were excluded from analyses. Across the two survey years, 558 students had missing data (no response or response ‘cannot comment’) for a positive pack image items and 559 had missing data (no response or ‘cannot comment’) for the negative pack image items and were excluded from analyses. Therefore, analyses based on: positive image: 2001: 3553; 2013: 3484; negative image: 2011: 3555; 2013: 3479.
*Analyses included smoking status, sex, age, school denomination and state as covariates.
†Measure on scale ranging from 1 ‘strongly disagree’ to 5 ‘strongly agree’.
MS, past month smokers; NSNS, non-susceptible never-smokers; SNS, susceptible never-smokers; Triers, tried smoking.