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. 2020 Mar 31;3(3):e201913. doi: 10.1001/jamanetworkopen.2020.1913

Table 3. Multivariable Logistic Regression Predicting the Administration of Adjuvant Radiation Therapy.

Covariate OR (95% CI) P value
Age at diagnosis, y 0.98 (0.98-0.98) <.001
Race
White 1 [Reference]
Black 1.11 (1.04-1.18) .001
Other 1.11 (1.01-1.23) .04
Charlson-Deyo Comorbidity Index score
0 1 [Reference]
1 0.87 (0.82-0.92) <.001
2 0.90 (0.78-1.03) .11
≥3 0.96 (0.76-1.23) .78
Facility type
Community cancer program 1 [Reference]
Comprehensive community cancer program 0.82 (0.75-0.90) <.001
Academic or research program 0.57 (0.52-0.62) <.001
Integrated network cancer program 0.63 (0.57-0.69) <.001
Primary payer
Not insured 1 [Reference]
Private insurance or managed care 0.76 (0.65-0.88) <.001
Medicaid 1.02 (0.85-1.22) .84
Medicare 0.76 (0.65-0.88) <.001
Other government 1.09 (0.89-1.33) .40
Annual median income quartiles in 2000, $US
<30 000 1 [Reference]
30 000-34 999 1.00 (0.92-1.09) .96
35 000-45 999 1.01 (0.93-1.10) .80
≥46 000 1.06 (0.97-1.16) .21
Individuals in the area with no high school degree in 2000, quartiles, %
≥29 1 [Reference]
20-28.9 1.07 (0.99-1.15) .11
14-19.9 0.99 (0.91-1.08) .81
<14 0.96 (0.88-1.04) .32
Distance from facility, miles 1.00 (1.00-1.00) <.001
Year of diagnosis 0.98 (0.97-1.00) .01
Tumor category
T2 1 [Reference]
T3 2.64 (2.38-2.93) <.001
T4 7.01 (6.29-7.82) <.001
Gleason score
≤6 1 [Reference]
7 6.36 (6.04-6.71) <.001
8-10 6.54 (5.25-8.14) <.001
Lymph node invasion
Absent 1 [Reference]
Present 1.83 (1.72-1.96) <.001
Surgical margins status
Negative 1 [Reference]
Positive 3.79 (3.63-3.96) <.001

Abbreviation: OR, odds ratio.