Skip to main content

Table 1 Distributions of select variables in breast cancer cases and cancer-free controls

From: Functional promoter -765 G > C variant in COX-2 gene is associated with the susceptibility of breast cancer in Chinese Han women

Variables Case (N = 465), % Control (N = 799), % P*
Age at diagnosis or recruitment (year)
Mean ± SD 52.0 ± 11.0 50.8 ± 13.2 0.110
 <52 239 51.4 437 54.7 0.257
 ≥52 226 48.6 362 45.3  
Age at menarche (year)    
Mean ± SD 14.55 ± 1.84 14.89 ± 1.76 0.002
 <14 136 29.3 183 22.9 0.012
 ≥14 329 70.7 616 77.1  
Tumor size      
 Less than 2 cm 126 27.1    
 2 to 5 cm 310 66.7    
 More than 5 cm 29 6.2    
LN involvement      
 Negative 251 54.0    
 Positive 214 46.0    
ER      
 Negative 162 34.8    
 Positive 303 65.2    
PR      
 Negative 209 44.9    
 Positive 256 55.1    
HER-2      
 Negative 309 66.4    
 Positive 156 33.6    
  1. ER, estrogen receptor; PR, progestin receptor; LN, lymph node; HER-2, human epidermal growth factor receptor 2; *T-test or two-sided χ2-test.