Table 4.

Percentage of current manufactured cigarette smokers who buy brands from upper, middle, and lower price-tiers, 2009 and 2011.

	Upper-tier brands			Middle-tier brands			Lower-tier brands
	2009	2011	Relative change (%)	2009	2011	Relative change (%)	2009	2011	Relative change (%)
Overall	12.4 (10.7, 14.3)	8.6 (6.9, 10.6)	−30.6 (p = 0.001)	51.3 (48.1, 54.5)	51.4 (48.1, 54.8)	0.2 (p = 0.960)	36.3 (33.2, 39.5)	40.0 (36.7, 43.4)	10.1 (p = 0.134)
Bangkok	24.7 (20.7, 29.2)	16.2 (13.0, 20.0)	−34.3 (p = 0.000)	40.7 (36.6, 45.0)	57.3 (52.5, 62.0)	40.7 (p = 0.000)	34.6 (30.4, 38.9)	26.5 (22.5, 30.8)	−23.5 (p = 0.002)
Central	11.5 (7.8, 16.6)	10.7 (7.9, 14.4)	−6.5 (p = 0.780)	50.3 (44.8, 55.8)	53.6 (47.5, 59.5)	6.5 (p = 0.448)	38.2 (33.4, 43.4)	35.7 (30.3, 41.5)	−6.5 (p = 0.501)
North	11.5 (7.3, 17.6)	4.5 (2.5, 7.9)	−60.6 (p = 0.000)	43.9 (35.8, 52.5)	38.8 (31.0, 47.3)	−11.7 (p = 0.364)	44.6 (36.4, 53.1)	56.7 (48.3, 64.7)	27.1 (p = 0.081)
Northeast	3.6 (2.2, 5.9)	8.9 (5.0, 15.1)	143.5 (p = 0.117)	57.0 (49.2, 64.6)	39.3 (32.5, 46.5)	−31.2 (p = 0.000)	39.3 (31.9, 47.3)	51.9 (44.2, 59.5)	31.9 (p = 0.054)
South	21.1 (16.6, 26.5)	3.0 (1.9, 4.5)	−85.9 (p = 0.000)	56.7 (51.1, 62.1)	75.2 (69.3, 80.2)	32.7 (p = 0.000)	22.2 (17.8, 27.3)	21.8 (16.9, 27.7)	−1.6 (p = 0.922)

Notes: 95% confidence intervals in parentheses; p values for relative changes are based on the respective z-statistics.