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Table 3 Multivariate analysis of the prognostic factors associated with breast cancer-specific survival before and after propensity score matching

From: Omission of adjuvant radiotherapy following breast-conserving surgery for elderly women with early-stage pure mucinous breast carcinoma

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
  1. CI confidence intervals; HR, hazard ratio; PSM propensity score matching