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Table 1 Characteristics of the study subjects

From: A49T, V89L and TA repeat polymorphisms of steroid 5α-reductase type II and breast cancer risk in Japanese women

Characteristic Cases (n = 237) Controls (n = 185) Chi-square P value
Age *     
   < 45 years 53 38   
   ≥ 45 years 184 147 0.20 0.65
Body mass index     
   < 22 kg/m2 126 99   
   ≥ 22 kg/m2 111 86 0.005 0.94
Age at menarche     
   < 14 years 113 92   
   ≥ 14 years 124 93 0.17 0.68
Age at first birth     
   < 25 years 96 67   
   ≥ 25 years 112 98   
   No birth 29 20 1.36 0.51
Number of births     
   < 2 56 43   
   ≥ 2 181 142 0.009 0.93
Menopause state     
   Premenopause 134 71   
   Postmenopause 103 114 13.72 < 0.001
Alcohol     
   < 1 day/week 184 148   
   ≥ 1 day/week 53 37 0.35 0.56
Smoking     
   Noncurrent 211 169   
   Current 26 16 0.63 0.43
Family history of breast cancer (mother and /or sisters)     
   No 207 173   
   Yes 30 12 4.42 0.04
  1. * Age at diagnosis for cases and at study enrollment for controls.
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