Increase per year in the weighted % difference in cost of smoking for cost-minimising strategies from GAM
| Increase in the % difference in cost of smoking for each consecutive year (95% CI) | P value for interaction | |
| Factory-made cigarette consumption · time | −0.12 (−0.23 to 0.00) | 0.051 |
| RYO cigarette consumption · time | 0.00 (−0.12 to 0.13) | 0.992 |
| Illicit sources · time | 0.93 (−1.44 to 3.31) | 0.441 |
| Cross-border purchase · time | −0.23 (−2.54 to 2.09) | 0.848 |
Models were adjusted for age, gender, social grade and other cost-minimising strategies in the table.
GAM, generalised additive models; RYO, roll your-own tobacco.