Table 3.

Association between quartiles of cumulative selenium intake and fracture stratified by residence, gender, hypertension, region, and drinking.

Factors	Q1	Q2	Q3	Q4	P for interaction
Urbanization levels					0.013
Low	0.74 (0.50–1.09)	1.00	0.83 (0.54–1.30)	1.31 (0.84–2.05)
Medium	1.00 (0.69–1.44)	1.00	1.40 (1.00–1.97)	0.96 (0.65–1.42)
High	1.59 (1.09–2.31)	1.00	1.47 (1.05–2.04)	1.76 (1.26–2.46)
Sex					0.644
Men	0.92 (0.66–1.28)	1.00	1.15 (0.87–1.51)	1.28 (0.97–1.70)
Women	1.19 (0.88–1.60)	1.00	1.37 (1.01–1.86)	1.37 (0.98–1.92)
Smoking
No	1.23 (0.95–1.60)	1.00	1.35 (1.04–1.76)	1.51 (1.15–1.99)	0.338
Yes	0.74 (0.49–1.11)	1.00	1.09 (0.78–1.51)	1.07 (0.75–1.52)
Alcohol drinking
No	1.07 (0.83–1.39)	1.00	1.12 (0.86–1.46)	1.19 (0.89–1.58)	0.204
Yes	0.99 (0.65–1.48)	1.00	1.46 (1.05–2.04)	1.55 (1.10–2.18)
Region					0.788
North	0.81 (0.56–1.16)	1.00	1.17 (0.85–1.61)	1.30 (0.94–1.80)
South	1.03 (0.79–1.33)	1.00	1.22 (0.95–1.56)	1.07 (0.81–1.42)

Models adjusted for the same covariates as model 3 in Table 2. Stratification variables were not adjusted in the corresponding models.