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. 2011 Jun 27;119(10):1472–1477. doi: 10.1289/ehp.1103516

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Estimated percent difference in Fe_NO^a and 95% CI associated with an increase^b in each length of road metric: (A) adjusting for asthma status and (B) fitting separate models by asthma status. ^aAdjusted for race/ethnicity, sex, asthma status (A), asthma medication, rhinitis history, age at collection, BMI percentile, secondhand tobacco smoke, parental education, month and hour of Fe_NO collection, outdoor testing, and community of residence. ^bExposure contrasts: 100 m, 300 m, and 1,000 m for length of roads in a 50-m, 100-m, and 200-m buffer, respectively.