Long-term evaluation of the rise in legal age-of-sale of cigarettes from 16 to 18 in England: a trend analysis

Table 5 Secondary analysis—results of the best fitting GAMM post-age-of-sale trend analysis

	Unadjusted				Adjusted for sex and social grade and population-level policies
	OR	95%CI		p	OR	95%CI		p
	OR	Lower	Upper	p	OR	Lower	Upper	p
Current smoking 16–17
Trend	0.996	0.928	1.070	0.919	1.005	0.935	1.081	0.883
Level	0.841	0.537	1.319	0.452	0.739	0.456	1.199	0.221
Change in slope	0.997	0.929	1.071	0.936	0.988	0.919	1.062	0.743
Current smoking 18–24
Trend	0.979	0.951	1.007	0.144	0.975	0.947	1.003	0.082
Level	1.073	0.887	1.297	0.468	1.119	0.919	1.362	0.264
Change in slope	1.014	0.985	1.004	0.336	1.017	0.988	1.047	0.253
Change in slope ^2	1.000	1.000	1.000	0.114	1.000	1.000	1.000	0.003
Ever smoking 16–17
Trend	0.989	0.922	1.061	0.756	0.996	0.928	1.070	0.914
Level	0.915	0.588	1.423	0.694	0.844	0.526	1.356	0.484
Change in slope	1.004	0.936	1.077	0.912	0.997	0.928	1.070	0.928
Ever smoking 18–24
Trend	0.979	0.952	1.007	0.133	0.974	0.947	1.002	0.073
Level	1.030	0.857	1.240	0.751	1.059	0.874	1.284	0.556
Change in slope	1.016	0.988	1.045	0.278	1.019	0.990	1.048	0.196
Change in slope ^2	1.000	1.000	1.000	0.377	1.000	1.000	1.000	0.029
Quit attempts 16–17
Trend	1.019	0.902	1.151	0.766	1.028	0.907	1.164	0.666
Level	0.451	0.204	1.000	0.050	0.448	0.193	1.036	0.061
Change in slope	0.978	0.867	1.105	0.723	0.969	0.855	1.098	0.623
Change in slope 18–24
Trend	0.982	0.939	1.026	0.412	0.980	0.937	1.024	0.364
Level	0.975	0.737	1.290	0.859	0.982	0.735	1.311	0.901
Change in slope	1.013	0.969	1.059	0.561	1.016	0.971	1.062	0.497

ISSN: 1741-7015