Table 3.

Cytokine levels in exposed to cigarette smoking (ETS) and non-exposed to cigarette smoking (NETS) groups. Data are presented as mean ± SD.

Parameters	ETS (n = 20)	NETS (n = 20)
IF-γ (ng L -1 )	1.24 ± 0.50	0.81 ± 0.36*
TNF-α (ng L -1 )	21.80 ± 10.70	26.10 ± 14.40
IL-1β (ng L -1 )	5.48 ± 1.87	3.49 ± 1.93*
IL-6 (ng L -1 )	6.83 ± 0.93	5.24 ± 2.16*
IL-8 (ng L -1 )	31.10 ± 6.30	31.10 ± 5.80
IL-2 (ng L -1 )	54.80 ± 7.10	42.80 ± 6.80†

IF-γ: Interferon gamma; TNF-α: Tumor necrosis factor alpha; IL: Interleukin.

*† indicate significant differences at p < 0.01; and p < 0.001, respectively.