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. 2013 Oct 1;11:248. doi: 10.1186/1477-7819-11-248

Table 3.

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

Variable
 Triple negative (n = 129)
 Non-triple negative (n = 577)
 Pa
  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  

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.