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. Author manuscript; available in PMC: 2013 Jan 15.
Published in final edited form as: Cancer. 2011 Jun 29;118(2):333–341. doi: 10.1002/cncr.26295

Table 4. Logistic Regression Models of Radiation Therapy Underascertainment.

Los Angeles Detroit
Odds Ratio 95% Confidence Interval P-value* Odds Ratio 95% Confidence Interval P-value*
Stage 0.008 0.026
0 1.00 1.00
I 0.82 0.64 1.03 0.67 0.35 1.28
II 1.32 0.94 1.83 0.69 0.30 1.56
III 0.76 0.49 1.21 0.26 0.09 0.70
Age <0.001 0.36
<50 3.01 2.09 4.31 1.34 0.54 3.30
50-64 1.91 1.38 2.66 0.95 0.42 2.16
65+ 1.00 1.00
Race 0.14 0.13
White 1.00 1.00
Black 0.84 0.63 1.12 0.57 0.32 1.04
Hispanic 0.78 0.61 0.99
Other 0.59 0.2 1.71
Income <0.001 0.050
<$20,000 1.12 0.79 1.60 1.15 0.48 2.71
$20,000-$69,999 1.66 1.31 2.11 1.96 1.19 3.24
$70,000+ 1.00 1.00
Unknown 1.02 0.76 1.37 1.42 0.72 2.78
Insurance <0.001 0.87
None 1.94 1.23 3.05 <0.001 <0.001 >999
Medicaid 1.26 0.86 1.87 0.82 0.31 2.17
Medicare 2.19 1.60 3.00 0.70 0.30 1.67
Other 1.00 1.00
Surgery Type <0.001 <0.001
Breast conservation 1.00 1.00
Mastectomy 2.07 1.50 2.85 4.93 2.84 8.57
Chemotherapy Receipt <0.001 0.045
Yes 1.84 1.43 2.37 1.86 1.02 3.41
No 1.00 1.00
Delay Initiating RT <0.001 0.15
Yes 1.93 1.52 2.44 0.66 0.38 1.16
No 1.00 1.00
Diagnosed at ACoS Accredited Hospital <0.001 <0.001
Yes 1.00 1.00
No 1.30 1.10 1.55 2.05 1.40 3.00
*

P values for group variables are reported from Wald tests; standard errors were adjusted for hospital clustering.

**

There were too few Hispanic patients in Detroit to support a separate category. Thus, Hispanics in Detroit were included in the “other” race category.

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