Table 3.

Multivariate analysis for predictors of i.v. bisphosphonate use

	Odds ratio	95% confidence interval
Age
65–69	1.0 (ref)
70–74	0.88	0.78–1.01
75–79	0.81	0.70–0.93
80+	0.49	0.42–0.57
Race/ethnicity
White	1.00 (ref)
Black	0.78	0.62–0.98
Hispanic	0.81	0.61–1.06
Other	0.78	0.58–1.05
Marital status
Married	1.00 (ref)
Unmarried	1.00	0.90–1.11
Unknown	0.94	0.68–1.29
Poverty (from least to most)
1st quartile	1.00
2nd quartile	0.91	0.78–1.05
3rd quartile	0.95	0.80–1.12
4th quartile	0.96	0.78–1.17
Unknown	1.74	0.98–3.10
Education (from most to least)
1st quartile	1.00 (ref)
2nd quartile	0.91	0.78–1.06
3rd quartile	1.13	0.96–1.33
4th quartile	0.86	0.71–1.05
Stage at diagnosis
In situ	1.00 (ref)
Localized	2.89	2.17–3.85
Regional	11.04	8.30–14.69
Distant	114.83	85.87–153.55
Unknown	12.65	7.77–20.59
Calendar year
1995	0.01	0.00–0.46
1996	0.14	0.08–0.26
1997	0.49	0.38–0.62
1998	1.0 (ref)
1999	1.52	1.32–1.75
2000	2.22	1.90–2.60
2001	2.55	2.17–3.00
2002	2.21	1.87–2.61
2003	4.46	3.79–5.24
2004	4.94	4.19–5.82