Table 5. Stratification analysis for associations between genotypes of IL-1β and the risk of silicosis.

	-580C>T OR (95%CI) *			Ex5+14C>T OR (95%CI) *
	CC	CT	TT	CC	CT
CDE(mg/m3-y)
<120	1.00	0.93(0.47–1.84)	0.56(0.24–1.27)	1.00	0.14(0.02–1.14)
≥120	1.00	0.96(0.48–1.92)	0.56(0.24–1.31)	1.00	0.96(0.27–3.40)
Age(years)
<70	1.00	0.60(0.22–1.63)	0.58(0.17–2.02)	1.00	—
≥70	1.00	1.00(0.58–1.73)	0.76(0.39–1.49)	1.00	0.54(0.20–1.48)
Smoking
No	1.00	1.32(0.52–3.38)	1.22(0.40–3.74)	1.00	0.25(0.03–2.24)
Yes	1.00	0.78(0.45–1.36)	0.57(0.28–1.13)	1.00	0.66(0.21–2.07)

^*ORs were obtained from a logistic regression model that was adjusted for age, smoking status, and CDE.