Figure 1From: Exhaled nitric oxide in a population-based study of Southern California Schoolchildren Percentile distributions of estimated online FeNO for healthy, allergy-only, asthma-only, and allergy-plus-asthma subjects. See Table 1 for number of subjects in each group. Allergy-only and allergy-plus-asthma groups are significantly (P < 0.0001) different from healthy group; asthma-only group is not significantly different.Back to article page