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Table 1 The general characteristics of breast cancer patients and healthy controls from Taiwanese women blood donors

From: Results based on 124 cases of breast cancer and 97 controls from Taiwan suggest that the single nucleotide polymorphism (SNP309) in the MDM2 gene promoter is associated with earlier onset and increased risk of breast cancer

Characteristics, n(%)a Cases Control p-valueb
Age (yrs)    
   Mean 53.3 38.7 < 0.0001
   S.D. 9.62 15.2  
Body mass index (BMI, kg/m 2 ) 24.09 ± 4.2 21.66 ± 3.13 < 0.0001
Breastfeeding    
   Yes 53 (42.7) 33 (34) 0.2794
   No 71 (57.3) 64 (66)  
High calorie intake    
   Yes 34 (27.4) 31 (32) 0.2786
   No 90 (72.6) 66 (68)  
Cardiovascular disease/diabetes    
   Yes 42 (33.9) 15 (15.5) 0.0019
   No 82 (66.1) 82 (84.5)  
Oral contraceptive pills usage    
   Yes 31 (25) 11 (11.3) 0.0202
   No 93 (75) 86 (88.7)  
  1. a. Cases: n = 124; controls: n = 97. The percentages were shown in the parentheses
  2. b. Age and BMI were determined by two-sample t tests; breastfeeding, high calorie intake, cardiovascular disease/diabetes, and oral contraceptive drugs usage were determined by chi-square tests.