Table 2.

IFN-γ Methylation Level (%) to Demographic and Clinical Characteristics

Characteristics	Category	IFN-γ
		Mean ± SE	p
Age (year)	< 30	42.9±3.5	NS
	≥ 30	47.4±3.2
Gender	Female	58.0±6.7	0.045
	Male	43.6±2.5
DI exposed	HDI	41.7±2.7	0.017
	MDI	61.1±6.4
	TDI	50.3±6.4
Smoking status	Current	57.5±4.7	0.004
	Never	41.5±2.6
Atopy	Negative	47.5±4.1	NS
	Positive	44.0±2.9
Methacholine PC20 (mg/ml)	< 2	52.6±5.3	0.035
	≥ 2	49.9±3.8
	≥ 32	38.6±3.6
Duration of DI exposure (month)	< 72	44.9±3.5	NS
	≥ 72	45.7±3.3

Note. NS, no statistical significant with a p value > 0.05.