Table 2 Odds ratios and 95% confidence intervals from multinomial logistic regression models comparing first course therapy groups with breast conserving surgery (BCS) as referent group

KP Region

 1

1.0

1.20 (0.97-1.49)

1.16 (0.91-1.48)

2.76 (1.88-4.04)

 2

1.0

2.10 (1.47-2.99)

2.19 (1.49-3.22)

3.69 (2.07-6.59)

 3

1.0

1.31 (0.96-1.78)

0.75 (0.52-1.08)

0.32 (0.08-1.33)

 4

[Referent]

[Referent]

[Referent]

 5

1.0

3.00 (2.24-4.02)

1.93 (1.39-2.70)

4.59 (2.87-7.34)

 6

1.0

0.62 (0.56-0.70)

0.75 (0.66-0.85)

1.39 (1.09-1.78)

Age at diagnosis

 <50 years

[Referent]

[Referent]

[Referent]

 50-59 years

1.0

1.12 (0.96-1.30)

0.79 (0.67-0.93)

0.54 (0.42-0.70)

 60-69 years

1.0

0.98 (0.84-1.14)

0.69 (0.59-0.82)

0.29 (0.22-0.39)

 70+ years

1.0

0.54 (0.45-0.63)

0.55 (0.46-0.65)

0.08 (0.05-0.13)

Race/Ethnicity

 White

[Referent]

[Referent]

[Referent]

 African American

1.0

0.88 (0.74-1.04)

0.91 (0.75-1.10)

0.56 (0.39-0.80)

 Asian

1.0

1.11 (0.95-1.30)

1.62 (1.37-1.91)

0.52 (0.36-0.76)

 Hispanic

1.0

1.30 (1.08-1.56)

1.16 (0.94-1.42)

0.69 (0.48-1.00)

Census Tract % College Educated (Quintiles)

 1: 32.3% - 78.8%

1.0

1.11 (0.94-1.30)

0.99 (0.83-1.19)

1.06 (0.78-1.46)

 2: 78.9% - 86.3%

1.0

1.06 (0.90-1.24)

0.77 (0.64-0.92)

0.78 (0.56-1.08)

 3: 86.5% - 92.2%

1.0

1.05 (0.89-1.24)

0.88 (0.73-1.05)

0.82 (0.59-1.14)

 4: 92.3% - 95.7%

1.0

1.00 (0.84-1.18)

0.76 (0.63-0.92)

0.75 (0.53-1.05)

 5 (highest): > 95.7%

[Referent]

[Referent]

[Referent]

Year of Diagnosis

1.0

1.06 (1.04-1.08)

1.00 (0.99-1.02)

1.16 (1.12-1.20)

Comorbidity Index

 0

[Referent]

[Referent]

[Referent]

 1

1.0

0.84 (0.73-0.96)

1.01 (0.87-1.18)

0.88 (0.66-1.17)

 2+

1.0

0.75 (0.62-0.89)

0.95 (0.78-1.16)

0.81 (0.53-1.23)

Nuclear Grade

 Low/Intermediate

[Referent]

[Referent]

[Referent]

 High

1.0

2.01 (1.80-2.25)

2.70 (2.39-3.06)

2.52 (2.03-3.14)

 Unknown

1.0

0.93 (0.79-1.10)

1.16 (0.96-1.40)

1.07 (0.73-1.57)