Table 5. Induced sputum gene expression of study participants.

Gene copies per 104 copies of GAPDH†	Chimney stove	Open fire	p-value
TNF-α (median, IQR)	299 (111, 509)	682 (165, 1566)	0.12
(n = 29)	(n = 14)	(n = 15)
IL-8 (median, IQR)	519 (20, 2016)	575 (268, 1349)	0.55
(n = 29)	(n = 14)	(n = 15)
MMP-12 (median, IQR)	0.01 (0.005, 0.08)	0.10 (0.02, 0.22)	0.17
(n = 27)	(n = 14)	(n = 13)
MMP-9 (median, IQR)	0.002 (0.0008, 0.006)	0.01 (0.003, 2.96)	0.01
(n = 22)	(n = 12)	(n = 10)

^†glyceraldehyde 3-phosphate dehydrogenase.