Table 2. Multivariable Logistic Regression Models Using Presurgical and Postsurgical Variables .
| Variable | OR (95% CI) |
|---|---|
| Presurgical variables | |
| Race/ethnicity | |
| White non-Hispanic | 1 [Reference] |
| White Hispanic | 1.38 (1.22-1.57) |
| Black | 1.39 (1.27-1.51) |
| Other | 1.17 (0.99-1.38) |
| Insurance type | |
| Private | 1 [Reference] |
| Medicaid | 1.71 (1.57-1.85) |
| Medicare | 1.10 (1.04-1.15) |
| Uninsured | 1.45 (1.30-1.62) |
| Primary tumor site | |
| Oral cavity | 1 [Reference] |
| Oropharynx | 0.41 (0.39-0.43) |
| Hypopharynx | 0.64 (0.55-0.74) |
| Larynx | 0.39 (0.36-0.41) |
| AJCC clinical stage | |
| I | 1 [Reference] |
| II | 1.54 (1.41-1.67) |
| III | 1.87 (1.72-2.02) |
| IV | 2.14 (2.00-2.30) |
| Charlson/Deyo comorbidity score | |
| 0 | 1 [Reference] |
| 1 | 0.71 (0.67-0.76) |
| >2 | 1.43 (1.28-1.60) |
| Treatment facility type | |
| Nonacademic | 1 [Reference] |
| Academic | 1.38 (1.32-1.45) |
| C index original | 0.670 (0.664-0.676) |
| Bootstrap-corrected C index | 0.670 (0.665-0.677) |
| Presurgical and postsurgical variables | |
| Race/ethnicity | |
| White non-Hispanic | 1 [Reference] |
| White Hispanic | 1.26 (1.11-1.42) |
| Black | 1.37 (1.26-1.49) |
| Other | 1.08 (0.92-1.28) |
| Insurance type | |
| Private | 1 [Reference] |
| Medicaid | 1.62 (1.49-1.76) |
| Medicare | 1.11 (1.05-1.17) |
| Uninsured | 1.50 (1.34-1.67) |
| Primary tumor site | |
| Oral cavity | 1 [Reference] |
| Oropharynx | 0.60 (0.57-0.64) |
| Hypopharynx | 0.65 (0.57-0.76) |
| Larynx | 0.41 (0.39-0.44) |
| US region | |
| Northeast | 1 [Reference] |
| Midwest | 0.71 (0.66-0.75) |
| South | 0.78 (0.73-0.83) |
| West | 0.91 (0.84-0.98) |
| Treatment facility type | |
| Nonacademic | 1 [Reference] |
| Academic | 1.29 (1.23-1.35) |
| Postoperative LOS, d | |
| 0-3 | 1 [Reference] |
| 4-7 | 1.75 (1.64-1.68) |
| 8-14 | 2.72 (2.53-2.92) |
| 15-21 | 4.14 (3.59-4.79) |
| >21 | 6.13 (5.15-7.31) |
| Surgical procedure and PORT at same facility | |
| Yes | 1 [Reference] |
| No | 1.36 (1.29-1.42) |
| C index original | 0.691 (0.686-0.696) |
| Bootstrap-corrected C index | 0.700 (0.695-0.706) |
Abbreviations: AJCC, American Joint Committee on Cancer; C index, concordance index; LOS, length of stay; OR, odds ratio; PORT, postoperative radiotherapy.