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Table 1 Distribution of Singapore Breast Cancer Screening Project cohort by risk factors in Gail model

From: Validation of the Gail model for predicting individual breast cancer risk in a prospective nationwide study of 28,104 Singapore women

  Total Cases (all breast cancer) Controls P value
  Number Percentage Number Percentage Number Percentage  
Total 28,104 100.0 575 100.0 27,529 100.0  
Age at menarche, years        
   ≥ 14 18,237 64.9 324 56.3 17,913 65.1 < 0.001
   12-13 8,952 31.9 213 37.0 8,739 31.7  
   < 12 915 3.3 38 6.6 877 3.2  
Any breast biopsy
Age at screening: ≥50 years
       
   No 26,631 94.8 514 89.4 26,117 94.9 < 0.001
   Yes 1,473 5.2 61 10.6 1,412 5.1  
Number of affected first-degree relatives
Age at first live birth: < 20 years
       
   0 4,753 16.9 68 11.8 4,685 17.0 < 0.001b
   1 89 0.3 3 0.5 86 0.3  
   > 1 1 0.0 0 0.0 1 0.0  
Number of affected first-degree relatives
Age at first live birth: 20-24 years
       
   0 10,321 36.7 149 26.3 10,172 37.0  
   1 216 0.8 13 2.1 203 0.7  
   > 1 6 0.0 2 0.3 4 0.0  
Number of affected first-degree relatives
Age at first live birth: 25-29 years or nulliparous
       
   0 9,246 32.9 230 40.0 9,016 32.8  
   1 303 1.1 17 3.0 286 1.0  
   > 1 4 0.0 0 0.0 4 0.0  
Number of affected first-degree relatives
Age at first live birth: > 30 years
       
   0 3,059 10.9 85 14.8 2,974 10.8  
   1 105 0.4 7 1.2 98 0.4  
   > 1 1 0.0 1 0.2 0 0.0  
  1. aAll P values were calculated by using chi-squared test unless otherwise stated. bP value calculated by using Fisher exact test.