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Table 3 Distribution of selected variables between triple negative and non-triple negative breast cancer patients

From: Family history and risk of ductal carcinoma in situ and triple negative breast cancer in a Han Chinese population: a case–control study

Variable

Triple negative (n= 129)

Non-triple negative (n= 577)

P a

 

N

%

N

%

 

Age at diagnosis, years

≤50

61

47.29

247

42.81

0.354

>50

68

52.71

330

57.19

 

Age at menarche, years

≤13

22

17.05

95

16.46

0.494

14 to 16

57

44.19

256

44.37

 

≥17

18

13.95

99

17.16

 

Not available

32

24.81

127

22.01

 

Childbearing history

0 children

4

3.10

17

2.95

0.934

1 child

62

48.06

288

49.91

 

2 children

28

21.71

117

20.28

 

≥ 3 children

12

9.30

64

11.09

 

Not available

23

17.83

91

15.77

 

Tumor size

≤2 cm

48

37.21

229

39.69

0.792

>2 cm

66

51.16

298

51.65

 

Not available

15

11.63

50

8.67

 

Lymph node involvement

Negative

84

65.12

280

48.53

0.001

Positive

45

34.88

290

50.26

 

Not available

0

0

7

1.21

 

Family history

Yes

8

6.20

30

5.20

0.599

No

110

85.27

512

88.73

 

Not available

11

8.53

35

6.07

 
  1. aChi-square test for age at diagnosis, tumor size, lymph node involvement, and family history distribution between triple negative and non-triple negative breast cancer patients; nonparametric rank test for distribution of age at menarche and childbearing between triple negative and non-triple negative breast cancer patients.