Table 1 Baseline characteristics of study analysis population

Age (years old)

n

145

136

281

ns

mean ± std.^a

47.3 ± 8.80

45.1 ± 8.49

46.2 ± 8.70

median

48

46

47

(25–67)

Height (cm)

n

145

136

281

ns

mean ± std

158.4 ± 4.87

158.1 ± 4.32

158.2 ± 4.61

median

158

158.5

158.5

(139–172)

Weight (kg)

n

145

136

281

ns

mean ± std

67.4 ± 9.77

66.8 ± 8.81

67.1 ± 9.30

median

66.0

66.5

66.0

(45–103)

BMI (kg/m^2)

n

145

136

281

ns

mean ± std

26.9 ± 3.58

26.7 ± 3.37

26.8 ± 3.48

median

26.2

26.6

26.4

(18.2–39.0)

Education

no school

0

(0.0)

2

(1.5)

2

(0.7)

ns

elementary

13

(9.0)

18

(13.2)

31

(11.0)

middle school

70

(48.3)

74

(54.4)

144

(51.3)

high school

32

(22.1)

25

(18.4)

57

(20.3)

college & up

30

(20.7)

17

(12.5)

47

(16.7)

Income level

poor

33

(22.8)

39

(28.7)

72

(25.6)

ns

low

62

(42.8)

60

(44.1)

122

(43.4)

middle

50

(34.5)

37

(27.2)

87

(31.0)

Tumor side

left

71

(49.0)

74

(54.4)

145

(51.6)

right

74

(51.0)

62

(45.6)

136

(48.4)

Surgery

MRM^a

143

(98.6)

131

(96.3)

274

(97.5)

BCS^a

2

(1.4)

5

(3.7)

7

(2.5)

TNM Stage

undetermined

10

(6.9)

9

(6.6)

19

(6.8)

ns

I

15

(10.3)

15

(11.0)

30

(10.7)

II

78

(53.8)

67

(49.3)

145

(51.6)

III

40

(27.6)

44

(32.4)

84

(29.9)

IV

2

(1.4)

1

(0.7)

3

(1.1)