Table 4.
Estimated percent difference in FeNOa associated with an increaseb in each TRP exposure metric.
| Exposure | Percent difference (95% CI) | p-Value | |||
|---|---|---|---|---|---|
| Distance: freeway | –0.15 | (–1.48 to 1.21) | 0.83 | ||
| Distance: major road | –0.72 | (–1.82 to 0.39) | 0.20 | ||
| Length all roads: 50-m buffer | 2.84 | (–2.45 to 8.42) | 0.30 | ||
| Length local roads: 50-m buffer | 4.75 | (–0.68 to 10.49) | 0.09 | ||
| Length all roads: 100-m buffer | 5.07 | (0.03 to 10.37) | 0.05 | ||
| Length local roads: 100-m buffer | 6.02 | (0.72 to 11.60) | 0.03 | ||
| Length all roads: 200-m buffer | 4.80 | (–0.42 to 10.29) | 0.07 | ||
| Length local roads: 200-m buffer | 6.84 | (1.10 to 12.90) | 0.02 | ||
| Density: 150-m buffer | 0.36 | (–1.00 to 1.73) | 0.61 | ||
| Density: 300-m buffer | 0.06 | (–0.88 to 1.01) | 0.90 | ||
| CALINE4 NOx: freeway | –0.32 | (–1.38 to 0.76) | 0.56 | ||
| CALINE4 NOx: nonfreeway | –0.63 | (–3.39 to 2.21) | 0.66 | ||
| Predicted NO | –2.59 | (–6.88 to 1.90) | 0.25 | ||
| Predicted NO2 | –1.17 | (–8.60 to 6.87) | 0.77 | ||
| Predicted NOx | –1.08 | (–3.98 to 1.90) | 0.48 | ||
| aAdjusted for race/ethnicity, sex, asthma status, asthma medication, rhinitis history, age at collection, BMI percentile, secondhand tobacco smoke, parental education, month and hour of FeNO collection, outdoor testing, and community of residence. bExposure contrasts: 500 m for distance to freeway; 200 m for distance to major road; 100 m, 300 m, and 1,000 m for length of roads in a 50-m, 100-m, and 200-m buffer, respectively; 10,000 vehicles/day for traffic densities; 5 ppb for CALINE4 predicted NOx; and 10 ppb for intracommunity predictions of NO, NO2, and NOx. | |||||