Table 2. Independent predictors of PMRT receipt.
| Variables | OR | 95% CI | P |
|---|---|---|---|
| Year of diagnosis | |||
| 2004 | 1 | ||
| 2005 | 0.929 | 0.760–1.135 | 0.471 |
| 2006 | 0.991 | 0.815–1.205 | 0.928 |
| 2007 | 1.183 | 0.983–1.423 | 0.075 |
| 2008 | 1.369 | 1.142–1.640 | 0.001 |
| 2009 | 1.291 | 1.077–1.547 | 0.006 |
| 2010 | 1.548 | 1.293–1.855 | <0.001 |
| 2011 | 1.986 | 1.653–2.386 | <0.001 |
| 2012 | 2.142 | 1.776–2.582 | <0.001 |
| Age (years) | |||
| <50 | 1 | ||
| ≥50 | 0.623 | 0.573–0.678 | <0.001 |
| Race/ethnicity | |||
| Non-Hispanic White | 1 | ||
| Non-Hispanic Black | 1.101 | 0.967–1.253 | 0.147 |
| Hispanic (all races) | 0.853 | 0.748–0.972 | 0.017 |
| Other | 0.978 | 0.852–1.124 | 0.759 |
| Grade | |||
| Well differentiated | 1 | ||
| Moderately differentiated | 1.409 | 1.182–1.679 | <0.001 |
| Poorly/undifferentiated | 1.745 | 1.468–2.073 | <0.001 |
| Tumor stage | |||
| T1 | 1 | ||
| T2 | 1.583 | 1.449–1.729 | <0.001 |
| Number of positive lymph nodes (n) | |||
| 1 | 1 | ||
| 2 | 1.497 | 1.360–1.648 | <0.001 |
| 3 | 2.640 | 2.367–2.948 | <0.001 |
| ER status | |||
| Negative | 1 | ||
| Positive | 0.963 | 0.838–1.106 | 0.595 |
| PR status | |||
| Negative | 1 | ||
| Positive | 0.961 | 0.847–1.091 | 0.543 |
| Marital status | |||
| Unmarried | 1 | ||
| Married | 1.004 | 0.917–1.099 | 0.932 |
PMRT, postmastectomy radiotherapy; CI, confidence interval; ER, estrogen receptor; OR, odds ratio; PR, progesterone receptor.