Table 2

Weighted percentage difference in cost of smoking for sociodemographics and cost-minimising strategies from GAM

	Percentage difference in cost of smoking (100β with 95% CI)
	Model 1	Models 2 to 5	Model 6
	Baseline model	Adjusted for sociodemographics	All variables
Age
Per 10 years increase	7.21 (6.42 to 8.01)		0.14 (−0.42 to 0.70)
Gender
Male	ref		ref
Female	2.22 (−0.34 to 4.78)		0.11 (−1.69 to 1.91)
Social grade
Low	ref		ref
Middle	−1.08 (−3.88 to 1.72)		1.44 (−0.52 to 3.40)
High			−1.50 (−4.33 to 1.32)
Factory-made cigarette consumption*
Per 10 cigarettes decrease		−10.17 (−10.35 to −9.99)	−12.99 (−13.18 to −12.80)
RYO cigarette consumption†
Per 10 cigarettes decrease		1.19 (1.44 to 0.94)	−5.86 (−6.06 to −5.66)
Use of illicit sources‡
No use of illicit sources in last 6 months		ref	ref
Used illicit sources in last 6 months		−5.91 (−10.59 to −1.23)	−9.64 (−12.94 to −6.33)
Cross-border purchase§
No cross-border purchase in last 6 months		ref	ref
Cross-border purchase in last 6 months		−7.04 (−11.72 to −2.37)	−9.47 (−12.74 to −6.20)

*50.4% of variance in spending accounted for by factory-made cigarette consumption.
†9.5% of variance in spending accounted for by RYO cigarette consumption.
‡0.1% of variance in spending accounted for by use of illicit sources of tobacco.
§0.1% of variance in spending accounted for by use of cross-border sources of tobacco.
GAM, generalised additive models; RYO, roll-your-own.