Table 6.

Independent factors predictive for serum KL-6 levels

	Standardized β coefficient	P-value
Age	0.040	0.673
Gender	−0.025	0.782
Smoking status	0.087	0.353
Lung Parenchymal involvement*	0.125	0.164
Molecular size of KL-6/MUC1 in serum	0.365	<0.001

* Based on radiographical stage.