Table 4. Comparisons of Time to Bone Metastasis .

Characteristic	Median Time (IQR), y		Wilcoxon Rank Sum Test P Value
	Osteoporosis Before Breast Cancer	No Osteoporosis Before Breast Cancer
Age at breast cancer diagnosis
Overall, y	1.78 (0.60-3.48)	2.87 (1.34-4.86)	<.001
>55 y	1.74 (0.56-3.14)	2.81 (1.16-4.60)	<.001
≤55 y	1.97 (0.66-4.28)	3.05 (1.48-5.13)	<.001
Treatment
Bisphosphonates	2.34 (1.23-3.13)	2.87 (1.34-4.86)	.08
Other osteoporosis drugs	2.08 (0.92-4.95)	2.87 (1.34-4.86)	.18
No therapy	1.74 (0.58-3.60)	2.87 (1.34-4.86)	<.001

Abbreviation: IQR, interquartile range.