Table 4.

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.