Table 2 Multivariable analysis of patient demographics and characteristics comparing patients who did not receive chemotherapy to patients who did receive chemotherapy

 Community cancer program

1.26

1.07–1.49

0.01

 Comprehensive community cancer program

1.20

1.09–1.32

< 0.001

 Academic/research program

REF

 Other

1.13

0.95–1.33

0.16

 < 40

REF

 40–49

0.48

0.38–0.61

< 0.001

 50–59

0.34

0.27–0.43

< 0.001

 60–69

0.20

0.16–0.26

< 0.001

 70–79

0.10

0.07–0.14

< 0.001

 80+

0.07

0.03–0.16

< 0.001

 Non-Hispanic White

REF

 Non-Hispanic Black

1.10

0.94–1.40

0.26

 Hispanic

1.04

0.85–1.27

0.73

 Non-Hispanic Asian/Pacific

0.94

0.76–1.17

0.60

 Other

1.15

0.94–1.40

0.19

 Not insured

1.09

0.80–1.48

0.59

 Private insurance

REF

 Medicaid

0.91

0.76–1.09

0.30

 Medicare

0.73

0.63–0.85

< 0.001

 Other

0.79

0.58–1.08

0.14

 Metro counties

REF

 Urban counties

0.87

0.76–1.00

0.05

 Rural counties

1.30

0.95–1.79

0.10

 Unknown

0.84

0.63–1.12

0.22

 0

REF

 1

1.09

0.95–1.24

0.22

 2

0.73

0.49–1.08

0.11

 Well differentiated, differentiated, NOS

REF

 Moderately differentiated, moderately well differentiated, intermediate differentiation

1.72

1.54–1.91

< 0.001

 Poorly differentiated

3.76

3.28–4.31

< 0.001

 T1C

REF

 T2

1.62

1.48–1.77

< 0.001

 Not present

REF

 Present

1.41

1.25–1.59

< 0.001

 Breast conservation

REF

 Mastectomy

1.35

1.06–1.72

0.02

 Negative

REF

 Positive

1.15

0.92–1.44

0.23

 Unknown

1.05

0.45–2.46

0.90

 None

REF

 Beam radiation

0.35

0.01–8.40

0.51

 No radiation treatment

0.25

0.01–6.20

0.40

 Breast or chest wall

REF

 Breast/lymph nodes or chest wall/lymph nodes

1.24

0.96–1.61

0.10

 Other

2.36

1.05–5.30

0.04

 Unknown

1.30

0.56–3.04

0.54