Table 2 Univariate comparison of clinical variables among patients with good prognosis and poor prognosis

Proportion of patients with poor prognosis score (%)

0.34

0.74

<0.0001

Mean age at breast cancer diagnosis (years)

57.5 (±12.4)

58.8 (±16.8)

0.59

Mean tumor size (mm)

21.3 (±11.5)

25.6 (±12.6)

0.05

Proportion of patients with tumor size <21 mm (%)

0.65

0.47

0.06

Proportion of patients with positive lymph nodes (%)

0.37

0.39

0.71

Proportion of patients with grade I (%)

0.23

0.08

0.06^a

Proportion of patients with grade II (%)

0.41

0.36

Proportion of patients with grade III (%)

0.36

0.56

Proportion of patients with estrogen-receptor-positive tumors (%)

0.83

0.79

0.61

Proportion of patients with progesterone-receptor-positive tumors (%)

0.77

0.55

0.01

Proportion of patients receiving chemotherapy (%)

0.18

0.21

0.69

Proportion of patients receiving endocrine therapy (%)

0.76

0.58

0.03

Proportion of patients receiving radiotherapy (%)

0.51

0.39

0.21