Table 1

Percentage of smokers reporting same brand at adjacent waves by age and income

	Wave 1–2 2002–3	Wave 2–3 2003–4	Wave 3–4 2004–6	Wave 4–5 2005–7	Wave 5–6 2006–7	Wave 6–7 2007–9	Wave 7–8 2008–10	Wave 8–9 2010–12
Total % with same brand, unadjusted	83.3	81.4	81.4	81.5	78.6	82.1	76.1	78.9
Age
18–24 years	75.4	69.2	69.2	71.2	72.2	62.2	42.9*	100.0†
25–39 years	82.9	81.0	79.3	83.0	79.9	84.2	73.8	75.0
40–54 years	85.9	82.5	85.7	84.1	81.3	83.3	76.0	81.0
≥55 years	85.7	86.8	80.4	77.7	74.1	80.4	79.2	77.4
χ²(3)	14.52	17.58	16.41	9.21	7.71	12.07	10.43	5.07
p Value	0.002	0.001	0.001	0.044	0.070	0.007	0.015	0.166
Income
Low	80.3	77.5	75.8	76.0	72.7	71.7	70.6	73.6
Medium	83.2	79.6	80.4	81.6	77.8	82.5	79.0	79.2
High	85.9	87.4	87.3	86.9	84.4	87.4	77.7	82.7
χ²(2)	5.44	13.55	17.46	13.66	15.35	30.24	5.39	6.28
p Value	0.066	0.001	0.0002	0.001	0.001	<0.0001	0.067	0.043