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Table 1 Baseline demographics and exposure of air pollutants among participants

From: Association between gaseous air pollutants and idiopathic nephrotic syndrome in children: a 12-year population-based cohort study

N = 255,141

 

n

%

Gender

Boys

131,696

51.6

Age, years

mean, SDa

6.43

3.38

 3–6

 

133,612

52.4

 7–12

 

103,217

40.5

  > 12

 

18,312

7.18

Monthly income (NTD)b

 < 14,999

213,695

83.8

15,000 − 19,999

31,229

12.2

 ≥ 20,000

10,217

4.00

Urbanization level

1 (highest)

84,887

33.3

2

81,626

32.0

3

48,375

19.0

4 (lowest)

40,253

15.8

Exposure

 SO2 level (daily average)

mean, SD

5.59

2.42

 THC level (daily average)

mean, SD

2.42

0.23

 CH4 level (daily average)

mean, SD

2.03

0.13

Participant follow-up years

mean, SD

10.8

2.78

Outcome

 Nephrotic syndrome

 

264

0.10

  1. aSD standard deviation, bMonthly income: new Taiwan Dollar (NTD), 1 NTD is equal to 0.03 USD