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

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Smooth association of length of local roads in a 50-m buffer with Fe_NO for children with asthma^a (black solid line: smooth fitted value for a child with average values for the adjustment covariates; black dashed line is the 95% CI). The estimated degrees of freedom (EDF) and the p-value testing the association of the smooth with Fe_NO are displayed. On the y-axis, values are plotted on the natural log scale and labeled on the original scale. ^aAdjusted for race/ethnicity, sex, 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.