Table 3.
Multivariate analysis of the prognostic factors associated with breast cancer-specific survival before and after propensity score matching
| Variables | Before PSM | After PSM | ||||
|---|---|---|---|---|---|---|
| HR | 95% CI | P | HR | 95% CI | P | |
| Age (years) | ||||||
| 65–69 | 1 | 1 | ||||
| 70–74 | 0.878 | 0.479–1.612 | 0.675 | 1.261 | 0.534–2.977 | 0.597 |
| 75–79 | 0.885 | 0.469–1.671 | 0.707 | 0.997 | 0.409–2.429 | 0.995 |
| > 79 | 1.985 | 1.135–3.473 | 0.016 | 2.004 | 0.936–4.433 | 0.086 |
| Race/ethnicity | ||||||
| Non-Hispanic White | 1 | 1 | ||||
| Non-Hispanic Black | 1.382 | 0.695–2.747 | 0.356 | 0.822 | 0.256–2.636 | 0.742 |
| Hispanic (All Races) | 0.676 | 0.248–1.842 | 0.444 | 0.713 | 0.223–2.288 | 0.570 |
| Other | 0.426 | 0.105–1.732 | 0.233 | 0.717 | 0.175–2.937 | 0.644 |
| Grade | ||||||
| Well-differentiated | 1 | 1 | ||||
| Moderately differentiated | 1.195 | 0.797–1.791 | 0.388 | 1.211 | 0.736–1.922 | 0.452 |
| Poorly differentiated/undifferentiated | 2.429 | 1.111–5.311 | 0.026 | 2.256 | 0.693–7.350 | 0.177 |
| Tumor stage | ||||||
| T1 | 1 | 1 | ||||
| T2 | 1.626 | 1.051–2.517 | 0.029 | 1.871 | 1.106–3.167 | 0.020 |
| Chemotherapy | ||||||
| No/unknown | 1 | 1 | ||||
| Yes | 1.572 | 0.492–5.019 | 0.445 | 3.143 | 0.745–13.256 | 0.119 |
| Radiotherapy | ||||||
| No/unknown | 1 | 1 | ||||
| Yes | 0.390 | 0.261–0.583 | < 0.001 | 0.445 | 0.273–0.723 | 0.001 |
CI confidence intervals; HR, hazard ratio; PSM propensity score matching