Table 3.
Multivariable analysis for independent factors associated with regional nodal radiotherapy compared to whole breast radiotherapy only in patients with 1–2 positive nodes who undergo SLNB only
| Outcome event = Radiotherapy directed at the breast and regional lymph nodes | N=6336 | |||
|---|---|---|---|---|
| Percent (%) | OR | 95% CI | p-Value | |
| Facility Type | ||||
| Academic/research program | 32.47 | reference | reference | reference |
| Community cancer program | 9.77 | 1.35 | 1.12–1.64 | 0.002 |
| Comprehensive community cancer program | 49.80 | 1 | 0.88–1.13 | 0.97 |
| Other | 7.97 | 0.71 | 0.57–0.88 | 0.002 |
| Facility location | ||||
| New England | 7.32 | reference | reference | reference |
| Middle Atlantic region | 15.85 | 0.65 | 0.52–0.83 | <0.001 |
| South Atlantic region | 21.50 | 1.02 | 0.81–1.27 | 0.88 |
| East North Central region | 18.30 | 1 | 0.80–1.25 | 0.99 |
| East South Central region | 4.67 | 0.97 | 0.71–1.32 | 0.86 |
| West North Central region | 7.65 | 0.91 | 0.69–1.18 | 0.46 |
| West South Central region | 4.70 | 0.71 | 0.52–0.97 | 0.03 |
| Mountain region | 5.79 | 1.09 | 0.81–1.45 | 0.58 |
| Pacific region | 14.23 | 0.82 | 0.65–1.04 | 0.11 |
| Race | ||||
| White | 78.40 | reference | reference | reference |
| Black | 9.25 | 1.05 | 0.86–1.27 | 0.64 |
| Hispanic | 5.35 | 0.78 | 0.60–1.01 | 0.06 |
| Asian/Pacific | 3.42 | 0.71 | 0.52–0.97 | 0.03 |
| Other or Unknown | 3.57 | 0.83 | 0.62–1.10 | 0.19 |
| Median Income | ||||
| <$38,000 | 13.54 | reference | reference | reference |
| $38,000–$47,999 | 19.60 | 1.13 | 0.94–1.37 | 0.17 |
| $48,000–$62,999 | 27.19 | 1.19 | 0.99–1.43 | 0.04 |
| $63,000 + | 39.51 | 1.01 | 0.85–1.21 | 0.71 |
| Number of positive nodes | 0.15 | |||
| 1 | 86.30 | reference | reference | reference |
| 2 | 13.70 | 1.97 | 1.70–2.28 | <0.001 |