Table 1.

Clinical characteristics of the study groups.

	Normal (n = 21)	Silicosis (n = 37)
Age, years	56.8 ± 1.1	57.7 ± 2.1
Gender
Male, n(%)	11(52.4)	22(59.5)
Female, n(%)	10(47.6)	15(40.5)
Stage
I, n(%)	—	13(35.1)
II, n(%)	—	8(21.6)
III, n(%)	—	16(43.3)
Serum FSTL1 (ng/mL)	52.49 ± 2.99	65.13 ± 4.28*

Values are mean ± SEM.

*P < 0.05, significant difference compared with normal.