Table 2.

Multivariable logistic regression models for association between receipt of MRI and patient, tumor, and hospital characteristics, SEER-Medicare 2005-2009

		Ductal Carcinoma In-Situ		Invasive Breast Cancer
Characteristic	Category	OR (95% CI)a	p-value	OR (95% CI)a	p-value
Age Group, years	66-69	Referent	<0.0001	Referent	<0.0001
	70-74	0.88 (0.75, 1.03)		0.80 (0.74, 0.86)
	75-79	0.67 (0.56, 0.80)		0.60 (0.55, 0.65)
	80-84	0.44 (0.36, 0.56)		0.39 (0.36, 0.43)
	85+	0.23 (0.16, 0.33)		0.20 (0.18, 0.23)
Race	White	Referent	0.84	Referent	<0.0001
	Black	0.92 (0.69, 1.21)		0.77 (0.67, 0.88)
	Other	0.89 (0.68, 1.18)		0.79 (0.69, 0.90)
SEER Registry	California	Referent	<0.0001	Referent	<0.0001
	Utah	0.52 (0.31, 0.87)		0.65 (0.54, 0.79)
	Seattle	1.37 (1.06, 1.77)		1.72 (1.54, 1.91)
	San Jose	0.45 (0.29, 0.71)		0.51 (0.42, 0.62)
	San Francisco	0.32 (0.21, 0.47)		0.44 (0.37, 0.53)
	Rural Georgia	0.41 (0.05, 3.43)		0.43 (0.19, 0.95)
	New Mexico	1.58 (0.98, 2.55)		2.09 (1.74, 2.51)
	New Jersey	0.70 (0.57, 0.87)		0.69 (0.63, 0.76)
	Louisiana	0.53 (0.38, 0.74)		0.53 (0.45, 0.61)
	Los Angeles	1.20 (0.93, 1.55)		1.54 (1.38, 1.71)
	Kentucky	0.18 (0.12, 0.29)		0.28 (0.23, 0.33)
	Iowa	0.35 (0.23, 0.52)		0.42 (0.35, 0.49)
	Hawaii	0.10 (0.04, 0.29)		0.08 (0.04, 0.15)
	Greater Georgia	0.38 (0.28, 0.51)		0.40 (0.35, 0.46)
	Detroit	0.31 (0.22, 0.45)		0.53 (0.46, 0.62)
	Connecticut	0.68 (0.52, 0.89)		0.75 (0.66, 0.84)
	Atlanta	0.84 (0.60, 1.17)		0.64 (0.54, 0.76)
Residenceb	Urban	Referent	0.49	Referent	0.87
	Rural	1.12 (0.80, 1.57)		1.01 (0.89, 1.15)
Married	Married	Referent	<0.0001	Referent	<0.0001
	Not married	0.75 (0.65, 0.86)		0.87 (0.82, 0.92)
Median Income	<= $35,800	Referent	<0.0001	Referent	<0.0001
	$35,801-$47,300	1.42 (1.14, 1.76)		1.32 (1.21, 1.45)
	$47,301-$64,200	1.62 (1.3, 2.02)		1.58 (1.44, 1.73)
	>$64,200	2.02 (1.62, 2.52)		2.21 (2.01, 2.43)
Comorbidity Scorec	None	Referent	<0.0001	Referent	<0.0001
	1	0.77 (0.66, 0.90)		0.78 (0.73, 0.84)
	2+	0.60 (0.47, 0.75)		0.57 (0.51, 0.62)
Diagnosis Year	2005	Referent	<0.0001	Referent	<0.0001
	2006	1.57 (1.20, 2.06)		1.67 (1.50, 1.86)
	2007	2.98 (2.31, 3.85)		3.05 (2.75, 3.39)
	2008	5.41 (4.25, 6.90)		4.42 (4.00, 4.89)
	2009	4.94 (3.87, 6.31)		4.94 (4.47, 5.46)
Histology	Invasive Ductal			Referent	<0.0001
	Invasive Lobular			1.95 (1.80, 2.12)
	Invasive Lobular & Ductal			1.57 (1.42, 1.74)
	Invasive Other	n/a		0.87 (0.78, 0.98)
Grade	Low	Referent	0.56	Referent	0.01
	Intermediate	0.91 (0.78, 1.07)		1.10 (1.02, 1.19)
	High	0.96 (0.77, 1.20)		1.09 (1.00, 1.10)
	Unknown	0.89 (0.73, 1.09)		0.93 (0.80, 1.08)
Stage	I			Referent	0.01
	II	n/a		1.18 (1.09, 1.28)
	III			1.07 (0.94, 1.21)
Tumor Size	<1cm	Referent	<0.0001	Referent	0.0003
	1 to <2cm	1.09 (0.91, 1.31)		1.04 (0.97, 1.12)
	2cm to <5cm	1.30 (1.07, 1.58)		0.83 (0.75, 0.92)
	5+ cm	1.68 (1.24, 2.28)	0.76 (0.65, 0.90)
	Unknown	0.82 (0.68, 0.97)	0.95 (0.74, 1.22)
Estrogen Receptor	Positive	Referent	0.05	Referent	0.001
	Negative	1.13 (0.94, 1.35)		1.14 (1.04, 1.24)
	Unknown	0.84 (0.70, 0.99)		0.81 (0.69, 0.94)
Teaching Hospitald	No	Referent	0.58	Referent	0.01
	Yes	0.95 (0.81, 1.12)		1.09 (1.02, 1.17)
	Unknown	0.63 (0.23, 1.72)		1.44 (0.98, 2.11)
Member of NCI Cooperative Group Triale	No	Referent	<0.0001	Referent	<0.0001
	Yes	1.97 (1.66, 2.33)		1.94 (1.81, 2.07)
	Unknown	2.08 (0.75, 5.78)		0.97 (0.66, 1.43)

^aOR = odds ratio; 95%CI = 95% confidence interval.

^bResidence is based on the woman's county of residence at time of breast cancer diagnosis and is categorized into urban which includes big metropolitan, metropolitan, and urban versus rural which includes less urban and rural counties.

^cComorbidity Index is based on the method of Klabunde et al.(14)

^dTeaching hospital is based on the hospital where the breast surgery was performed.

^eMembership in an NCI Cooperative group trial indicates if the hospital where the surgery was performed participated in at least one NCI trial.