Table 4.

Univariate linear regression analysis: correlations between annual change in FEV₁ and plasma adiponectin levels according to gender and smoking status.

Gender	Smoking status from 2004-2006	n	β	P
Men	never	148	-0.28	0.0006
Men	current	106	-0.25	0.0087
Men	past	151	0.002	0.9713
Women	never	426	-0.09	0.0594
Women	current	21	-0.291	0.1998
Women	past	9	-0.28	0.4653

Explanatory variable: plasma adiponectin level (μg/mL).

Dependent variable: annual change in FEV₁ (%/year).

β, standard partial regression coefficient.