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Table 2 Demographic characteristics of participants from the KNHANES (2008–2009), according to quartile of blood mercury levels (n = 3972)

From: Population correlates of circulating mercury levels in Korean adults: the Korea National Health and Nutrition Examination Survey IV

  Geometric mean of mercury N Quartile of blood mercury level  
    Q1 (0.88-3.06) Q2 (3.07-4.36) Q3 (4.37-6.41) Q4 (6.42-56.97) p-value
  (μg/L)   % % % %  
Age (years)        <0.001
 20-29 3.81 775 26 21 19 11  
 30-39 4.48 795 18 23 21 19  
 40-49 5.04 800 15 19 20 27  
 50-59 5.15 790 14 18 22 25  
 ≥60 4.15 812 27 19 18 18  
Men 5.35 1994 32 41 57 72 <0.001
Overweight/obesity (BMI ≥ 23) 5.13 1242 25 27 32 42 <0.001
Smoking status        <0.001
 Never 3.99 2126 68 61 49 37  
 Former 5.22 807 14 17 21 29  
 Current 5.14 1033 18 22 30 34  
Alcohol intake (≥1/week) 5.68 938 13 17 26 38 <0.001
Eating-out (≥1/day) 4.88 713 17 21 24 27 <0.001
MET-h/week        0.003
 <20 4.29 1693 48 43 42 39  
 20-39 4.60 763 19 20 19 20  
 ≥40 4.69 1493 33 37 39 41  
Income level        <0.001
 Low 4.14 1004 30 27 24 22  
 Mid low 4.45 968 24 26 25 23  
 Mid high 4.43 965 26 26 23 24  
 High 5.06 964 20 21 28 31  
Education        <0.001
 Middle school or less 4.36 1340 39 31 33 33  
 High school 4.38 1490 37 42 38 34  
 College or more 4.82 1125 24 27 29 33  
Residence area        <0.001
 Midwest 3.67 475 18 12 11 7  
 North 4.23 1873 51 51 48 38  
 Southwest 4.48 504 13 12 13 13  
 Mideast 5.36 422 8 10 10 14  
 Southeast and an island 5.52 698 10 15 18 28