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Table 1 Characteristics of case and controls

From: Plasma homocysteine levels and genetic polymorphisms in folate metablism are associated with breast cancer risk in chinese women

  Cases (n = 96) n (%) Controls (n = 85) n (%) p
Age    
18–29 12(12.5) 9(17.6)  
30–39 25(26.0) 22(25.9)  
40–49 37(38.5) 37(43.5)  
50–59 14(14.6) 13(15.3)  
60–69 4(4.17) 3(3.53)  
70–79 4(4.17) 1(1.18)  
Mean age (SD) 47.83(±10.9) 45.22(±11.8) 0.37
Drinking habit    
Never 83(89.6) 81(95.3)  
Formera 6(6.25) 0(0)  
Current 4(4.17) 1(1.18)  
Moderateb 2(2.08) 1(1.18) 0.21
Heavyc 1(1.04) 0(0)  
Unknown 0(0) 3(3.53)  
Somking habit    
Never 76(79.2) 85(100) <0.01
Formera 14(14.6) 0(0) <0.01
Current (pack years) 6(6.25) 0(0)  
0–19 2(2.08) 0(0)  
≥20 3(3.12) 0(0)  
Unknown 1(1.04) 0  
BMI    
<18.5 9(9.38) 7(8.24)  
18.5–24.9 30(31.3) 26(30.6)  
≥25.0 53(55.2) 50(58.8)  
Unknown 4(4.17) 2(2.35) 0.87
Regular exercise    
Yes 62(64.6) 63(74.1)  
No 29(30.2) 21(21.9)  
Unknown 5(5.21) 1(1.04) 0.11
Family history of breast cancer    
Yes 0(0) 0(0)  
No 96(100) 85(100)  
Unknown 0(100) 0(100) 1.00
Menopausal status    
Premenopausal 69(71.9) 64(75.3)  
Postmenopausal 27(28.1) 21(24.7) 0.74
Age at menarche    
≤12 24(25) 19(22.4)  
13–14 66(68.8) 60(70.6)  
≥15 2(2.08) 44.70)  
Unknown 4(4.16) 2(2.35) 0.82
Age at menopause    
≤47 4(4.17) 2(2.35)  
48–52 13(13.5) 10(11.8)  
≥53 9(9.38) 7(8.24)  
Unknown 1(1.04) 2(2.35) 0.91
Others 2(2.08) 1(1.17) 0.21
  1. SD, standard deviation; BMI, body mass index.
  2. aFormer smokers and drinkers were defined as subject who had quit smoking and drinking at at least 1 year previously.
  3. bModerate drinker <5 days per week.
  4. cHeavy drinker ≥5 days per week.