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Table 2 Residential NRAP exposures from freeway and non-freeway sources for in utero, first year of life, and childhood periods in children in the CHS

From: Longitudinal associations of in utero and early life near-roadway air pollution with trajectories of childhood body mass index

Exposure Period Mean ± SD Median IQR Range
Freeway NOx (ppb)
In utero 16.7 ± 20.1 10.8 4.4–22.1 0–233.3
 First year of life 16.2 ± 19.5 10.4 4.1–21.9 0–304.2
 Childhood 15.1 ± 18.9 9.6 4.6–18.1 0–351.0
Non-Freeway NOx (ppb)
In utero 10.3 ± 7.4 8.7 5.2–13.7 0.0003–74.0
 First year of life 9.3 ± 6.7 7.9 4.6–12.2 0.0003–77.4
 Childhood 6.2 ± 4.7 5.2 3.2–7.6 0.09–65.7