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Table 6 Prevalence of breast cancer risk factors in the nested case-control study within Singapore Breast Screening Programme (SBSP) cohort and relative risks ( RR ) from SBSP and the Breast Cancer Detection and Demonstration Project (BCDDP)

From: Assessing risk of breast cancer in an ethnically South-East Asia population (results of a multiple ethnic groups study)

   Cases Control Total (%)   RR  
      E-GAIL-SBSP S-GAIL-SBSP BCDDP
Women ( n )   439 1,198 1,637 1,637 1,637 5,998
AGEMEN (y)        
≥14   246 772 1,018 (62.19) 1 1 1
12–13   173 377 550 (33.60) 1.23 1.27 1.10
<12   20 49 69 (4.22) 1.50 1.61 1.21
AGECAT (y) NBIOPS       
<50 0 2 10 12 (0.73) 1
  1 0 1 1 (0.06) 1.70
  2 2.88
≥50 0 396 1,109 1,505 (91.94) 1
  1 41 78 119 (7.27) 1.27
  2 1.62
AGEFLB (y) NUMREL       
<20 0 54 182 236 (14.42) 1 1 1
  1 2 5 7 (0.43) 2.17 2.17 2.61
  ≥2 4.70 4.73 6.80
20–24 0 123 431 554 (33.84) 1.19 1.20 1.24
  1 7 11 18 (1.10) 2.57 2.61 2.68
  ≥2 2 0 2 (0.12) 5.57 5.68 5.78
25–29 or nulliparous 0 172 410 582 (35.55) 1.40 1.44 1.55
  1 13 15 28 (1.71) 3.05 3.14 2.76
  ≥2 6.60 6.83 4.91
≥30 0 62 139 201 (12.28) 1.66 1.73 1.93
  1 3 5 8 (0.49) 3.61 3.77 2.83
  ≥2 1 0 1 (0.06) 7.82 8.20 4.17
BMI (kg/m2)        
< 23.0   126 476 602 (36.82) 1
23.0 – 27.4   207 497 704 (43.06) 1.46
≥ 27.5   106 223 329 (20.12) 2.14
PARITY        
≥3   263 801 1,064 (65.00) 1
1–2   112 276 388 (23.70) 1.23
0   64 121 185 (11.30) 1.50