Table 3 Multivariate Analyses of OS and BCSM in original samples and matched samples

Age (years)

< 40

Reference

Reference

Reference

Reference

40–49

0.95

0.22–4.08

0.949

0.66

0.14–3.01

0.597

0.84

0.19–3.70

0.814

0.86

0.19–3.96

0.857

50–59

0.55

0.14–2.27

0.410

1.04

0.24–4.39

0.957

0.49

0.12–2.06

0.333

1.07

0.24–4.65

0.923

60–69

0.36

0.09–1.44

0.147

0.83

0.19–3.53

0.805

0.29

0.07–1.20

0.087

0.91

0.20–4.05

0.903

70–79

0.16

0.04–0.63

0.009

2.24

0.53–9.39

0.268

0.19

0.05–0.81

0.025

1.43

0.30–6.82

0.650

Race

Black

Reference

Reference

Reference

Reference

White

1.61

1.21–2.15

0.001

0.61

0.36–1.04

0.075

2.32

1.50–3.60

0.001

0.39

0.20–0.75

0.005

Others

1.64

1.01–2.68

0.047

0.54

0.21–1.40

0.211

2.54

1.10–5.90

0.030

0.25

0.05–1.12

0.071

Tumor

(Ic vs Ib)

0.84

0.67–1.04

0.111

1.39

0.88–2.20

0.153

0.87

0.56–1.34

0.524

1.50

0.70–3.22

0.290

LN

(N1 vs N0)

0.61

0.48–0.78

0.001

2.11

1.37–3.24

0.001

0.76

0.54–1.07

0.112

1.66

0.96–2.88

0.069

Grade

I

Reference

Reference

Reference

Reference

II

0.96

0.78–1.18

0.679

1.35

0.88–2.07

0.158

0.84

0.56–1.25

0.384

1.38

0.71–2.66

0.332

III

0.85

0.57–1.26

0.418

1.69

0.84–3.42

0.141

0.66

0.37–1.17

0.156

1.35

0.50–3.64

0.552

Surgery

No surgery

Reference

Reference

Reference

Reference

BCS

7.19

4.91–10.53

0.001

0.06

0.03–0.12

0.001

10.84

5.39–21.80

0.001

0.06

0.02–0.17

0.001

Mastectomy

7.39

5.24–10.41

0.001

0.06

0.03–0.10

0.001

8.11

4.51–14.58

0.001

0.08

0.03–0.19

0.001

Chemotherapy

(Yes vs No)

0.82

0.62–1.09

0.172

2.33

1.47–3.67

0.001

0.90

0.65–1.26

0.553

2.41

1.32–4.39

0.004

Radiotherapy

(Yes vs No)

2.07

1.58–2.70

0.001

0.48

0.29–0.82

0.007

1.41

0.89–2.23

0.142

0.66

0.32–1.34

0.253