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Table 1 baseline characteristics

From: A nomogram to predict the high-risk RS in HR+/HER2-breast cancer patients older than 50 years of age

  Total N (%) RS low-risk N (%) RS high-risk N (%) P-value
Age     0.001
 Mean ± SD 63.33 ± 8.38 64.13 ± 8.56 62.41 ± 8.09  
Menstrual status     0.193
 Pre- 77 (7.0%) 47 (8.0%) 30 (5.9%)  
 Post- 1023 (93.0%) 542 (92.0%) 481 (94.1%)  
Tumor size     0.017
 ≤ 2 cm 778 (70.7%) 435 (73.9%) 343 (67.1%)  
 > 2 cm 322 (29.3%) 154 (26.1%) 168 (32.9%)  
Histologic subtype     0.006
 IDC 955 (86.8%) 501 (85.1%) 454 (88.8%)  
 Mixed 73 (6.6%) 52 (8.8%) 21 (4.1%)  
 Others 72 (6.5%) 36 (6.1%) 36 (7.0%)  
Tumor grade      < 0.001
 I 140 (12.7%) 102 (17.3%) 38 (7.4%)  
 II 787 (71.5%) 428 (72.7%) 359 (70.3%)  
 III 173 (15.7%) 59 (10.0%) 114 (22.3%)  
LVI     0.782
 Yes 54 (4.9%) 30 (5.1%) 24 (4.7%)  
 No 1046 (95.1%) 559 (94.9%) 487 (95.3%)  
ER status      < 0.001
 Mean ± SD 89.24 ± 15.07 91.79 ± 11.08 86.30 ± 18.21  
PR status      < 0.001
 Mean ± SD 47.08 ± 36.80 62.29 ± 33.68 29.55 ± 32.19  
Ki-67 index      < 0.001
 Mean ± SD 18.97 ± 16.16 15.20 ± 12.73 23.32 ± 18.45  
Luminal subtype      < 0.001
 Luminal-A like 332 (30.2%) 257 (43.6%) 75 (14.7%)  
 Luminal-B like 768 (69.8%) 332 (56.4%) 436 (85.3%)