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Table 3 Relative changes in FeNO per log-transformed IQR increase in BC at different lag periods

From: Exposure to traffic-related air pollution and changes in exhaled nitric oxide and DNA methylation in arginase and nitric oxide synthase in children with asthma

Lag

Model 1

p

Model 2

p

Model 3

p

Model 4

p

n

Relative change in FeNO (95%CI)

 

n

Relative change in FeNO (95%CI)

 

n

Relative change in FeNO (95%CI)

 

n

Relative change in FeNO (95%CI)

 

Lag 0-6 h

89

1.14 (1.03, 1.26)

0.01

89

1.14 (1.02, 1.27)

0.02

89

1.14 (1.03, 1.28)

0.02

73

1.17 (1.02, 1.33)

0.02

Lag 7-12 h

89

1.12 (1.00, 1.25)

0.06

89

1.12 (0.99, 1.26)

0.07

89

1.12 (0.99, 1.26)

0.07

73

1.21 (1.05, 1.38)

0.01

Lag 13-24 h

89

0.97 (0.88, 1.07)

0.55

89

0.97 (0.88, 1.07)

0.55

89

0.97 (0.88, 1.07)

0.54

73

0.99 (0.89, 1.11)

0.91

Lag 0-24 h

89

1.03 (0.95, 1.13)

0.45

89

1.03 (0.94, 1.13)

0.52

89

1.03 (0.94, 1.13)

0.53

73

1.04 (0.93, 1.15)

0.49

Lag 25-48 h

86

0.96 (0.87, 1.07)

0.47

86

0.96 (0.86, 1.07)

0.49

86

0.96 (0.86, 1.07)

0.47

70

0.98 (0.86, 1.12)

0.75

Lag 49-72 h

83

1.11 (1.00, 1.24)

0.06

83

1.11 (0.98, 1.26)

0.09

83

1.11 (0.98, 1.26)

0.09

67

1.06 (0.92, 1.21)

0.44

Lag 73-96 h

80

1.12 (1.00, 1.25)

0.06

80

1.12 (0.99, 1.26)

0.07

80

1.12 (0.99, 1.26)

0.07

64

1.07 (0.94, 1.22)

0.32

  1. Note: All estimates are from linear mixed effect model to reflect percent changes in FeNO per IQR increase in log-transformed BC. The IQR (μg/m3) was 1.8 for lag 0-6 h, 1.8 for lag 7-12 h, 1.2 for lag 13-24 h, 1.1 for lag 0-24 h, 1.5 for lag 25-48 h, 1.6 for lag 49-72 h and 1.3 for lag 73-96 h
  2. Model 1 was the unadjusted model
  3. Model 2 adjusted for day-of-week and week number when FeNO data were collected
  4. Model 3 further adjusted for age, gender and race/ethnicity
  5. Model 4 further adjusted for NO2