Table 3 Results of disease-free survival analysis by Cox proportional hazards model for the Ki67^Medium group

 35–50 vs < 35

0.865

0.110

6.797

0.891

0.872

0.098

7.723

0.902

 51–65 vs < 35

0.938

0.115

7.675

0.952

1.218

0.130

11.454

0.863

 > 65 vs < 35

0.994

0.090

11.048

0.996

0.605

0.028

13.007

0.748

 T2 vs T1

2.778

1.068

7.229

0.036

2.781

1.004

7.701

0.049

 T3 vs T1

9.961

0.036

37.642

0.001

6.421

1.226

33.629

0.028

 N1 vs N0

3.087

1.255

7.589

0.014

4.572

1.500

13.933

0.008

 positive vs negative

2.476

0.979

6.263

0.048

1.434

0.517

3.977

0.488

 III vs I/II

4.437

1.828

10.770

0.001

4.468

1.650

12.104

0.003

 < 20 vs ≥20

0.714

0.209

2.437

0.591

0.602

0.159

2.274

0.454

 Mastectomy vs BCS

2.455

1.001

6.020

0.050

0.452

0.108

1.890

0.277

 No vs Yes

0.556

0.129

2.396

0.431

1.048

0.116

9.452

0.967

 No vs Yes

2.042

0.830

5.021

0.120

8.786

1.779

43.388

0.008