Table 2.
Factors related to administration of adjuvant radiation therapy for stage 0–III postsurgical patients who had a tumor size ≥5 cm or the number of positive axillary lymph nodes ≥4 after mastectomy, or who underwent lumpectomy for adjuvant radiation therapy (N = 52 894)
| Characteristics | Unadjusted Odds ratio (95% CI) | P‐value | Adjusted Odds ratio (95% CI) a | P‐value |
|---|---|---|---|---|
| Gender (male) | 0.31 (0.23‐0.42) | <.001 | 0.61 (0.45‐0.84) | .002 |
| Lumpectomy | 3.64 (3.48‐3.79) | <.001 | 5.11 (4.80‐5.43) | <.001 |
| Age, years | ||||
| ≤64 | Reference | Reference | ||
| 65‐74 | 0.92 (0.89‐0.96) | <.001 | 0.91 (0.87‐0.95) | <.001 |
| ≥75 | 0.29 (0.27‐0.31) | <.001 | 0.27 (0.25‐0.28) | <.001 |
| Combined stage | ||||
| Stage 0 | Reference | Reference | ||
| Stage I | 1.20 (1.13‐1.28) | <.001 | 1.34 (1.26‐1.42) | <.001 |
| Stage II | 0.75 (0.71‐0.80) | <.001 | 1.17 (1.10‐1.25) | <.001 |
| Stage III | 0.56 (0.52‐0.59) | <.001 | 2.24 (2.05‐2.45) | <.001 |
a
Adjusted for Age, Gender, Combined stage, Lumpectomy.