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.