Table 4 Logistic regression analysis of receiving radiation therapy alone versus chemoradiation in patients that received definitive treatment (OR > 1 means that first factor is associated with higher odds of radiation therapy alone)

Variable

OR

95% CI

P-value

OR

95% CI

P-value

Elderly vs. Non-Elderly

3.81

3.30–4.04

< 0.0001

3.30

3.07–3.51

< 0.0001

Female vs. male

1.05

0.99–1.11

0.0840

1.04

0.99–1.10

0.1445

White vs. non-white

0.96

0.89–1.03

0.2684

–

–

–

Academic vs. non-academic

0.91

0.86–0.97

0.0024

1.02

0.96–1.09

0.5296

Private vs. non-private insurance

0.38

0.35–0.41

< 0.0001

0.68

0.63–0.73

< 0.0001

Median income (≥$48,000 vs. <$48,000)

1.18

1.12–1.25

0.0002

1.26

1.19–1.33

< 0.0001

County location (Metropolitan vs. non-metropolitan)

1.07

1.00–1.15

0.0473

1.05

0.97–1.14

0.2267

Clinical stage IIIB vs. stage IIIA

0.73

0.69–0.77

< 0.0001

0.82

0.78–0.87

< 0.0001

Distance to closest facility^a

0.90

0.88–0.92

< 0.0001

0.93

0.91–0.95

< 0.0001

Charlson-Deyo score (1 vs. 0)

1.31

1.24–1.38

< 0.0001

1.22

1.15–1.29

< 0.0001