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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.