Table 4.

Demographics of Reconstruction and Contralateral Risk Reduction Mastectomy among Women Diagnosed with Ductal Carcinoma in situ, National Cancer Data Base, 1998–2011

Variable	Mastectomy alone (N=87,130) Row %	Mastectomy with Reconstruction (N=44,179) Row %	ORa (95% CI)	Unilateral Mastectomy (N=104,970) Row %	Contralateral Mastectomy (N=26,339) Row %	ORa (95% CI)
Age group, y
<45	45.5	54.5	1	67.1	32.9	1
45–54	52.0	48.0	0.75 (0.72–0.79)	73.6	26.4	0.67 (0.65–0.70)
55–64	66.0	34.0	0.42 (0.41–0.44)	80.3	19.7	0.45 (0.43–0.47)
65–74	83.9	16.1	0.24 (0.23–0.25)	88.8	11.2	0.29 (0.27–0.31)
≥75	95.9	4.1	0.06 (0.05–0.06)	94.8	5.2	0.13 (0.12–0.14)
Year of diagnosis
1998–1999	78.7	21.3	1	91.4	8.6	1
2000–2001	74.5	25.5	1.31 (1.24–1.38)	88.4	11.6	1.43 (1.33–1.54)
2002–2003	72.9	27.1	1.40 (1.31–1.49)	85.0	15.0	1.85 (1.70–2.01)
2004–2005	69.9	30.1	1.57 (1.43–1.72)	82.0	18.0	2.12 (1.93–2.41)
2006–2007	64.5	35.5	2.04 (1.86–2.23)	77.3	22.7	2.95 (2.64–3.29)
2008–2009	58.5	41.5	2.76 (2.52–3.02)	72.8	27.2	3.79 (3.40–4.23)
2010–2011	53.6	46.4	3.57 (3.27–3.91)	69.7	30.3	4.56 (4.09–5.08)
Ancestry/ethnicity
Non-Hispanic, European	65.5	34.5	1	78.5	21.5	1
Non-Hispanic, African	72.0	28.0	0.69 (0.66–0.72)	88.5	11.5	0.43 (0.41–0.45)
Hispanic	66.3	33.7	0.83 (0.78–0.89)	83.2	16.8	0.57 (0.53–0.62)
Other	68.0	32.0	0.66 (0.63–0.70)	82.9	17.1	0.56 (0.52–0.60)
Geographic region
Northeast	60.6	39.5	1	81.2	18.8	1
Midwest	66.0	34.0	0.88 (0.85–0.92)	80.6	19.5	1.14 (1.10–1.20)
South	68.5	31.5	0.81 (0.78–0.84)	80.0	20.0	1.29 (1.24–1.34)
West	69.0	31.0	0.72 (0.68–0.75)	77.4	22.6	1.49 (1.42–1.56)

^aAdjusted for comorbidity index, health insurance, facility type, DCIS patient volume, tumor size and grade

Reconstruction: Test of interaction between year of diagnosis and ancestry/ethnicity: X²=25.90, df=18, P=0.10

Contralateral risk reducing mastectomy: Test of interaction between year of diagnosis and ancestry/ethnicity: X²=27.63, df=18, P=0.07