Table 10. Univariate and multivariate logistic regression analyses for factors that were predictive for decline in forced expiratory volume in 1(2004–2006) through second assessment (2009).

Univariate	OR	95% CI	P
sFe (per 1 SD increase)	0.576	(0.348, 0.906)	0.016
Multivariate	OR	95% CI	P
age (per 1 SD increase)	1.445	(0.860, 2.490)	0.170
Brinkman index (per 1 SD increase)	1.451	(0.850, 2.448)	0.157
sFe (per 1 SD increase)	0.535	(0.297, 0.898)	0.026
homocysteine (per 1 SD increase)	1.669	(1.086, 2.598)	0.017
uric acid (per 1 SD increase)	0.802	(0.494, 1.279)	0.360
haemoglobin(per 1 SD increase)	1.118	(0.641, 1.966)	0.693

CI, confidence interval; OR, odds ratio; SD, standard deviation; sFe, serum iron.