Table 1

Sample profile based on unweighted and weighted frequencies

	Full sample				Never-smokers
	Unweighted		Weighted*		Unweighted		Weighted*
	n	%	n	%	n	%	n	%
Total	3791	100	3788	100	2953	100	2920	100
Gender
Male	1898	50	1895	50	1502	51	1473	50
Female	1893	50	1892	50	1451	49	1448	50
Age
11	719	19	627	17	682	23	596	20
12	596	16	626	17	548	19	576	20
13	643	17	639	17	537	18	534	18
14	658	17	624	16	513	17	487	17
15	621	16	640	17	396	13	411	14
16	551	15	630	17	277	9	316	11
Mean (SD)	13.40 (1.70)		13.51 (1.71)		13.08 (1.63)		13.17 (1.64)
Social grade
Middle class (ABC1)	1529	41	1530	41	1258	43	1247	43
Working class (C2DE)	2230	59	2226	59	1669	57	1648	57
Not specified†	32		32		26		26
Smoking status
Never smoked	2953	79	2920	78	–	–	–	–
Ever smoked	804	21	834	22	–	–	–	–
Not specified†	34		33
Susceptibility
Non-susceptible	–	–	–	–	2258	77	2235	77
Susceptible	–	–	–	–	683	23	673	23
Not specified†					34		33
Year
2011	1373	36	1372	36	1025	35	1016	35
2014	1205	32	1203	32	948	32	948	32
2016	1213	32	1213	32	980	33	980	33

*Data are weighted to standardise by age and gender.
†Cases excluded due to missing data.