Table 3.

Cox proportional hazards models of osteoporotic fracture risk for older, long-term survivors of early-stage breast cancer versus age-matched comparison women

Covariates	All fractures		Hip and wrist fractures
	HR*	95% CI	HR*	95% CI
Model 1: Study site, age	1.0	0.8, 1.2	1.0	0.8, 1.3
Model 2: Study site, age plus race and body mass index	1.0	0.8, 1.2	1.0	0.8, 1.3
Model 3: Study site, age plus smoking status and comorbid conditions	1.0	0.8,1.2	1.0	0.8, 1.3
Model 4: Study site, age plus drug exposure**	1.1	0.9, 1.3	1.1	0.9, 1.4
Model 5: Study site, age plus all covariates: combined	1.1	0.9, 1.3	1.1	0.9, 1.4

^*HR = hazard ratio.

^**Drug exposure detail in Supplemental Table 1