Table 1.

Association between sociodemographics and time period with smoking status and number of cigarettes consumed per day

	Smoking status						Cigarettes per day
	Current versus never smoker			Recent/past versus never smoker
	OR	p Value	95% CI	OR	p Value	95% CI	OR*	p Value	95% CI
Age
16–54	1.00			1.00			1.00
55–59	0.92	<0.001	0.88 to 0.97	1.79	<0.001	1.70 to 1.89	1.80	<0.001	1.68 to 1.93
60–64	0.71	<0.001	0.68 to 0.75	2.19	<0.001	2.09 to 2.29	1.91	<0.001	1.79 to 2.04
65–69	0.62	<0.001	0.59 to 0.66	2.65	<0.001	2.53 to 2.78	1.79	<0.001	1.66 to 1.92
70–74	0.42	<0.001	0.39 to 0.44	2.41	<0.001	2.30 to 2.53	1.51	<0.001	1.39 to 1.64
75–79	0.29	<0.001	0.27 to 0.31	2.35	<0.001	2.23 to 2.48	1.18	0.001	1.07 to 1.30
80–84	0.21	<0.001	0.19 to 0.23	2.44	<0.001	2.29 to 2.60	0.94	0.330	0.82 to 1.07
85+	0.13	<0.001	0.12 to 0.15	2.36	<0.001	2.19 to 2.54	0.73	0.001	0.61 to 0.89
p Value for trend		<0.001			<0.001			<0.001
Gender
Men	1.34	<0.001	1.31 to 1.37	1.39	<0.001	1.35 to 1.43	1.49	<0.000	1.44 to 1.54
Women	1.00			1.00			1.00
Social grade
AB	1.00			1.00			1.00
C1	1.56	<0.001	1.50 to 1.63	1.00	0.897	0.97 to 1.04	1.03	0.416	0.96 to 1.09
C2	2.40	<0.001	2.31 to 2.50	1.09	<0.001	1.05 to 1.14	1.31	<0.001	1.23 to 1.39
D	2.88	<0.001	2.76 to 3.00	0.97	0.156	0.92 to 1.01	1.31	<0.001	1.23 to 1.40
E	4.72	<0.001	4.52 to 4.92	0.96	0.078	0.92 to 1.00	1.62	<0.001	1.53 to 1.72
p Value for trend		<0.001			0.008			<0.001
Survey years
2006–2008	1.00			1.00			1.00
2009–2010	0.88	<0.001	0.86 to 0.91	0.90	<0.001	0.86 to 0.94	0.86	<0.001	0.82 to 0.90
2011–2012	0.88	<0.001	0.86 to 0.91	1.14	<0.001	1.10 to 1.19	0.64	<0.001	0.61 to 0.68
2013–2015	0.80	<0.001	0.77 to 0.83	1.26	<0.001	1.22 to 1.31	0.55	<0.001	0.52 to 0.58
p Value for trend		<0.001			<0.001			<0.001

*Ordered logistic regression with the following outcomes: 10 or fewer cigarettes per day, 11–20 cigarettes per day, and 21 or more cigarettes per day.