Table 3.

Influence factors of biomarkers analyzed by multiple linear regressions.

Biomarkers	Groups	Variables in the Equation	B	p Value
TGF-β1	All subjects	Respirable fiber exposure level	0.103	0.001
	Ever-smokers	Respirable fiber exposure level	0.245	<0.001
	Never-smokers	-
	Male	Respirable fiber exposure level	0.098	0.010
	Female	Respirable fiber exposure level	0.106	0.043
CP	All subjects	Respirable fiber exposure level	8.027	0.007
		Gender	−14.710	0.001
		Smoking habit	13.926	0.002
	Ever-smokers	-
	Never-smokers	Respirable fiber exposure level	7.238	0.048
		Gender	−15.751	0.001
	Male	Smoking habit	14.334	0.004
	Female	Respirable fiber exposure level	10.006	0.048