Table 5. Multivariate linear regression analysis for factors predictive for forced vital capacity (FVC) % predicted in male subjects.

	Coefficient	SE	P
Age	−0.055	0.044	0.205
Brinkman index	−0.005	0.001	<0.0001
sFe	0.023	0.011	0.038
homocysteine	−0.059	0.061	0.329
uric acid	−0.599	0.332	0.072
Haemoglobin	0.074	0.368	0.839

Variables that were possibly associated with FVC % predicted, including Brinkman index, and homocysteine and uric acid levels were selected. To adjust for age, this parameter was also included in the analyses. Since sFe levels are strongly associated with haemoglobin concentration, the latter was also included as a variable. Data for sFe, haemoglobin, uric acid and homocysteine levels, and for Brinkman index was not available for 2, 2, 2, 29 and 266 of the 1502 male subjects, respectively. Data for a total of 1212 subjects was included in the final analyses.