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Table 2 Distribution of BC, daily average NO2, and FeNO

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

  N Mean SD IQR 25th Median 75th Min Max
BC (μg/m3) without MI 90 1.6 1.4 1.1 0.8 1.1 1.9 0.2 7.0
with MI 90 1.4 1.2 1.0 0.7 1.0 1.6 0.2 6.2
NO2(ppb) without MI 74 40.6 25.1 27.9 23.3 36.7 51.2 3.4 138.3
with MI 90 41.7 23.2 26.2 25.3 39.3 51.5 3.4 138.3
FeNO (ppb)   89 30.6 28.3 42.0 9.0 17.0 51.0 2.5 106.0
  1. BC data were measured 24-h before buccal sample collection
  2. Abbreviations: BC black carbon, NO2 nitrogen dioxide, FeNO fractional exhaled nitric oxide, MI multiple imputation, IQR interquartile range