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Table 5 Baseline characteristics and odds ratios (OR) of invasive breast cancer in the nested case-control study

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

Characteristics Categories Cases (N=439) Controls (N=1,198) Adjusted OR (CI) P
AGECAT (y) < 50 2 11 1.00 (referent) 0.317
  ≥ 50 437 1187 2.19 (0.47 to 10.13)  
AGEMEN (y) ≥ 14 246 772 1.00 (referent) 0.039
  12 – 13 173 377 1.23 (1.01 to 1.49)  
  < 12 20 49 1.51 (1.24 to 1.83)  
AGEFLB (y) < 20 56 187 1.00 (referent) 0.015
  20 – 24 132 440 1.19 (1.04 to 1.37)  
  25 – 29 or nulliparous 185 425 1.42 (1.23 to 1.64)  
  ≥ 30 66 144 1.69 (1.47 to 1.95)  
NUMREL 0 411 1162 1.00 (referent) 0.002
  1 25 36 2.15 (1.31 to 3.52)  
  ≥ 2 3 0 4.62 (2.82 to 7.56)  
NBIOPS 0 398 1119 1.00 (referent) 0.234
  ≥ 1 41 79 1.28 (0.85 to 1.94)  
ETHNICITY Chinese 377 1051 1.00 (referent)  
  Malay 15 29 0.96 (0.58 to 1.59) 0.868
  Indian 25 65 1.30 (0.67 to 2.50) 0.434
  Others 22 53 1.02 (0.60 to 1.74) 0.936
BMI (kg/m2) < 23.0 126 476 1.00 (referent) <0.001
  23.0 – 27.4 207 497 1.43 (1.22 to 1.68)  
  ≥ 27.5 106 223 2.04 (1.73 to 2.39)  
PARITY ≥ 3 263 801 1.00 (referent) 0.031
  1 – 2 112 276 1.22 (1.02 to 1.46)  
  0 64 121 1.49 (1.24 to 1.79)  
OC No 278 743 1.00 (referent) 0.894
  Yes 161 455 1.02 (0.80 to 1.29)  
HRT No 364 1022 1.00 (referent) 0.265
  Yes 75 173 1.19 (0.88 to 1.62)  
SMOKING No 415 1126 1.00 (referent) 0.831
  Yes 24 72 1.05 (0.98 to 1.72)  
WHR ≤ 0.85 293 863 1.00 (referent) 0.074
  > 0.85 146 335 1.25 (0.98 to 1.60)