aSeroatopy defined as any specific IgE ≥0.35 IU/mL to cockroach, mouse, D. farinae, dog, cat, mold, tree, grass or ragweed at age 7. (A) univariate linear regression model for Ni predicting FENO50 by seroatopic status. (B) univariate linear regression model for Ni predicting JNO by seroatopic status. (C) univariate linear regression model for Ni predicting Calv by seroatopic status. All x and y axes plotted on the natural log scale. P-values shown for multivariable models.