Table 9. Univariate logistic regression analyses for factors that were predictive for decline in forced vital capacity from first assessment (2004–2006) through second assessment (2009).

Univariate	OR	95% CI	P
sFe (per 1 SD increase)	0.756	(0.475, 1.158)	0.204

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