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Table 1 General Characteristics of Study Subjects

From: Fatty fish and fish omega-3 fatty acid intakes decrease the breast cancer risk: a case-control study

Variables Control (n = 360) Case (n = 358) P
Age (years) a 47.9 ± 8.7 48.3 ± 8.6 0.633
Body mass index (kg/m 2 )    
   < 18.5 8(2.2) 16(4.5) 0.003
   18.5- < 23 150(42.4) 153(42.7)  
   23- < 25 121(34.2) 85(23.7)  
   ≥ 25 75(21.2) 104(29.1)  
Family history (yes) 12(3.6) 17(4.8) 0.429
Supplement use (yes) 167(67.1) 194(54.3) 0.001
Marital status    
   Married 288(83.0) 289(80.7) 0.588
   Single 14(4.0) 20(5.6)  
   Divorced, Widowed, Other 45(13.0) 49(13.7)  
Education    
   ≤ Elementary school 21(6.1) 59(16.5) < 0.001
   Middle school 17(4.9) 44(12.3)  
   High school 176(51.2) 174(48.6)  
   ≥ College 130(37.8) 81(22.6)  
Occupation    
   Housewife 212(61.1) 217(60.6) 0.012
   Profession, Office worker 75(21.6) 54(15.1)  
   Sales, Service 43(12.4) 51(14.3)  
   Agriculture, Laborer, Unemployed, Other 17(4.9) 36(10.0)  
Smoking status    
   Nonsmoker 305(93.3) 318(89.1) 0.066
   Ex-smoker 12(3.7) 28(7.8)  
   Current smoker 10(3.0) 11(3.1)  
Alcohol consumption (g/day)    
   0 175(56.6) 190(53.1) 0.144
   0< ≡ 14.9 119(38.5) 137(38.2)  
   > 15 15(4.9) 31(8.7)  
Physical activity b (Met-min/week)    
   ≤ 396 77(22.9) 59(16.6) 0.076
   396-<1272 91(27.0) 114(32.0)  
   1272-<2772 81(24.0) 101(28.4)  
   ≥ 2772 88(26.1) 82(23.0)  
Age at menarche (years)    
   ≤ 13 97(28.9) 91(25.4) < 0.001
   14 74(22.0) 97(27.1)  
   15 86(25.6) 53(14.8)  
   ≥ 16 79(23.5) 117(32.7)  
Menopausal status    
   No 196(54.4) 210(58.7) 0.254
   Yes 164(45.6) 148(41.3)  
Age at menopause c (years)    
   < 46 37(26.6) 43(29.5) 0.697
   46-<49 35(25.2) 31(21.2)  
   49-<52 39(28.1) 47(32.2)  
   ≥ 52 28(20.1) 25(17.1)  
Type of menopause c    
   Natural 109(75.2) 98(66.7) 0.109
   Surgery, Other 36(21.8) 49(33.3)  
Postmenopausal hormone use c    
   Never 88(62.0) 115(80.4) < 0.001
   Ever 54(38.0) 28(19.6)  
Parity    
   No 46(12.8) 31(8.7) 0.074
   Yes 314(87.2) 327(91.3)  
  1. n (%) or mean ± SD
  2. a mean ± SD, b Metabolic equivalent units (METs) are multiples of the resting metabolic rate and calculated using the short form (version 2.0, April 2004) of the International Physical Activity Questionnaire (IPAQ), c postmenopausal women.