Table 4. Correlations between serum iron levels and spirometric parameters in male non-smokers and current/past smokers.

	Non-smokers		Current and past smokers
	r	P	r	P
FVC %predicted	0.022	0.614	0.076	0.016
FEV1%predicted	0.084	0.059	0.102	0.001
FEV1/FVC	0.117	0.009	0.081	0.011

FVC, forced vital capacity; FEV₁, forced expiratory volume in 1 s.