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Table 2 Baseline characteristics of participants exposed to quartile (Q1-Q4) daily average concentrations of total hydrocarbons (THC)

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

Variables

THC

N = 246,844

Q1

N = 63,003

Q2

N = 60,660

Q3

N = 70,328

Q4

N = 52,853

p-value

n

%

n

%

N

%

n

%

 

Age

mean, SDa

5.58

2.61

5.66

2.76

7.15

3.71

7.71

3.83

< 0.001

Boys

 

32,841

52.1

31,400

51.8

36,293

51.6

26,722

50.6

< 0.001

Monthly income (NTD)b

        

< 0.001

 

<  15,000

55,885

88.7

53,572

88.3

56,140

79.8

40,274

76.2

 
 

15,000 − 19,999

5794

9.20

5428

8.95

10,531

15.0

9118

17.3

 
 

≥ 20,000

1324

2.10

1660

2.74

3657

5.20

3461

6.55

 

Urbanization levelc

        

< 0.001

 

1 (highest)

17,524

27.8

13,907

22.9

24,184

34.4

26,212

49.6

 
 

2

15,355

24.4

24,605

40.6

23,393

33.3

15,832

30.0

 
 

3

14,606

23.2

10,230

16.9

14,777

21.0

7400

14.0

 
 

4 (lowest)

15,518

24.6

11,918

19.7

7974

11.3

3409

6.45

 

Outcome

Atopic dermatitis

504

0.80

788

1.30

2863

4.07

3149

5.96

< 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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