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Table 1 Demographic characteristics of participants from the KNHANES (2008–2009)

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

  N Sex p-value
   Men (n = 1994) Women (n = 1978)  
Range of mercury (μg/L) 3972 0.90-56.97 0.88-33.93 -
Mean mercury (μg/L) 3972 6.32 ± 0.12 4.25 ± 0.07 <0.001
Age (years, %)       0.9
20-29 775 396 (20) 379 (19)  
30-39 795 404 (20) 391 (20)  
40-49 800 400 (20) 400 (20)  
50-59 790 391 (20) 399 (20)  
≥60 812 403 (20) 409 (21)  
Overweight/obesity (BMI ≥ 23, %) 1242 691 (35) 551 (28) <0.001
Smoking status (%)       <0.001
Never 2126 395 (20) 1731 (87)  
Former 807 695 (35) 112 (6)  
Current 1033 899 (45) 134 (7)  
Alcohol intake (n/week) 3964 1.33 ± 0.03 0.53 ± 0.02 <0.001
MET-h/week       <0.001
<20 1693 747 (38) 946 (48)  
20-39 763 389 (20) 374 (19)  
≥40 1493 846 (42) 647 (33)  
Eating-out (n/week) 3450 5.26 ± 0.13 2.90 ± 0.10 <0.001
Income level (%)       0.1
Low 1004 498 (26) 506 (26)  
Mid low 968 481 (25) 487 (25)  
Mid high 965 461 (24) 504 (26)  
High 964 512 (26) 452 (23)  
Education (%)       <0.001
Middle school or less 1340 556 (28) 784 (40)  
High school 1490 782 (40) 708 (36)  
College or more 1125 642 (32) 483 (24)  
Residence area (%)       0.9
Midwest 475 234 (12) 241 (12)  
North 1873 944 (47) 929 (47)  
Southwest 504 248 (13) 256 (13)  
Mideast 422 207 (10) 215 (11)  
Southeast and an island 698 361 (18) 337 (17)  
  1. Values are n (%) or mean ± SE, except the range of mercury.