Table 1

Number of samples and air nicotine concentrations in Uruguay, 2002 and 2007

	2002			2007			% reduction (95% CI)
	No	Median (IQR)	GM (95% CI)	No	Median (IQR)	GM (95% CI)	Crude	Adjusted^‡
Overall	100	0.75 (0.29–1.54)	0.55 (0.41 to 0.75)	103	0.07 (0.03–0.20)	0.06 (0.04 to 0.09)	89 (82 to 93)^*	91 (85 to 94)^*
Institution
Hospital	27	0.80 (0.30–1.69)	0.67 (0.42 to 1.07)	24	0.13 (0.04–0.21)	0.10 (0.06 to 0.18)	85 (69 to 93)^*	89 (78 to 95)^*
Schools	18	0.08 (0.02–0.61)	0.10 (0.05 to 0.22)	18	0.004 (0.001–0.01)	0.004 (0.002 to 0.008)	97 (90 to 99)^*	97 (90 to 99)^*
Government building	21	0.67 (0.47–0.94)	0.56 (0.33 to 0.95)	23	0.14 (0.05–0.19)	0.10 (0.07 to 0.14)	83 (68 to 91)^*	86 (62 to 95)^*
Airport	14	1.15 (0.74–2.49)	1.32 (0.92 to 1.90)	18	0.05 (0.03–0.07)	0.05 (0.04 to 0.06)	96 (94 to 98)^*	94 (89 to 96)^*
Restaurants/bars	20	1.50 (0.54–2.71)	1.06 (0.55 to 2.02)	20	0.27 (0.19–0.67)	0.32 (0.20 to 0.52)	69 (32 to 86)^**	81 (45 to 94)^**
Ventilation
Natural only	13	0.64 (0.42–1.00)	0.49 (0.24 to 1.01)	27	0.10 (0.03–0.21)	0.07 (0.04 to 0.13)	86 (60 to 95)^*	88 (69 to 95)^**
Mixed (natural and mechanical)	73	0.69 (0.20–1.38)	0.47 (0.33 to 0.69)	55	0.04 (0.02–0.11)	0.03 (0.02 to 0.05)	93 (88 to 96)^*	93 (88 to 95)^*
Mechanical only	13	1.19 (0.94–3.27)	1.35 (0.74 to 2.47)	14	0.27 (0.21–1.26)	0.38 (0.18 to 0.80)	72 (26 to 89)^***	68 (11 to 88)^***
Volume (m³)
<100	23	0.64 (0.08–1.52)	0.42 (0.20 to 0.90)	26	0.17 (0.04–0.26)	0.09 (0.04 to 0.19)	80 (39 to 93)^**	86 (60 to 95)^*
100–500	45	0.72 (0.17–1.58)	0.48 (0.29 to 0.80)	41	0.06 (0.01–0.17)	0.04 (0.02 to 0.09)	91 (79 to 96)^*	93 (87 to 97)^*
≥500	30	0.84 (0.51–1.22)	0.84 (0.60 to 1.17)	36	0.07 (0.04–0.16)	0.07 (0.05 to 0.10)	91 (86 to 94)^*	92 (87 to 94)^*
Smoking allowed
Yes	19	1.58 (0.77–3.94)	1.41 (0.74 to 2.67)	2^†	0.27 (0.20–0.33)	0.26 (0.16 to 0.42)	—	—
No	76	0.64 (0.18–1.05)	0.43 (0.31 to 0.61)	101	0.07 (0.03–0.20)	0.06 (0.04 to 0.09)	86 (77 to 92)^*	91 (86 to 94)^*

↵* p value<0.001
↵** p value<0.01
↵*** p value<0.05.
↵† Reported smoking by employees only when establishment is closed.
↵‡ Adjusted for type of public place, ventilation and room volume.
GM, geometric mean.