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Table 4 Baseline characteristics of participants exposed to quartile (Q1-Q4) daily average concentrations of methane (CH4)

From: Association of exposure to hydrocarbon air pollution with the incidence of atopic dermatitis in children

Variables

CH4

N = 246,844

Q1

N = 57,832

Q2

N = 62,400

Q3

N = 64,035

Q4

N = 62,577

p-value

n

%

n

%

N

%

n

%

 

Age

mean, SDa

5.72

2.61

5.68

2.84

6.30

3.19

8.25

4.03

< 0.001

Boys

 

30,067

52.0

32,576

52.2

32,959

51.5

31,654

50.6

< 0.001

Monthly income (NTD)b

        

< 0.001

 

<  15,000

50,495

87.3

55,406

88.8

54,061

84.4

45,909

73.4

 
 

15,000 − 19,999

6026

10.4

5210

8.35

7732

12.1

11,903

19.0

 
 

≥ 20,000

1311

2.27

1784

2.86

2242

3.50

4765

7.61

 

Urbanization levelc

        

< 0.001

 

1 (highest)

17,455

30.2

19,681

31.5

23,868

37.3

20,823

33.3

 
 

2

14,939

25.8

22,318

35.8

22,219

34.7

19,709

31.5

 
 

3

14,376

24.9

11,388

18.3

10,443

16.3

10,806

17.3

 
 

4 (lowest)

11,062

19.1

9013

14.4

7505

11.7

11,239

18.0

 

Outcome

 Atopic dermatitis

482

0.83

921

1.48

1713

2.68

4188

6.69

< 0.001

  1. Chi-square test; aOne-way ANOVA; SD standard deviation
  2. bMonthly income: New Taiwan Dollar (NTD), 1 NTD is equal to 0.03 USD
  3. cUrbanization level: The urbanization level was categorized by the population density of the residential area into 4 levels, with level 1 as the most urbanized and level 4 as the least urbanized
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Italian Journal of Pediatrics

ISSN: 1824-7288

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