Table 3 Uni and multivariate COX regression analysis of survival in women with breast cancer (n = 2,715)

Univariate Analysis

Multivariate Analysis

Age (y)

P-value

HR

95% CI

P-value

HR

95% CI

 < 40

0.111

1.29

0.94–1.78

0.339

1.17

0.85–1.61

40 to 49

0.037

0.74

0.56–0.98

0.033

0.74

0.56–0.98

50 to 59

-

1.00

-

-

1.00

-

60 to 69

0.273

1.15

0.90–1.46

0.127

1.21

0.95–1.54

70 to 79

 < 0.001

2.02

1.59–2.56

 < 0.001

2.27

1.79–2.88

 ≥ 80

 < 0.001

4.09

3.20–5.22

 < 0.001

4.16

3.24–5.33

Univariate Analysis

Multivariate Analysis

Stage

P-value

HR

95% CI

P-value

HR

95% CI

Stage 0

0.049

0.61

0.37–0.99

0.101

0.66

0.41–1.08

Stage I

-

1.00

-

-

1.00

-

Stage II

0.057

1.39

0.99–1.96

0.016

1.53

1.08–2.15

Stage III

 < 0.001

3.72

2.70–5.12

 < 0.001

4.05

2.94–5.59

Stage IV

 < 0.001

8.00

5.99–10.68

 < 0.001

8.57

6.41–11.45

Unknown

 < 0.001

2.29

1.69–3.10

 < 0.001

2.08

1.54–2.82