TABLE 2.
The distribution of fractional exhaled nitric oxide (FENO) in nonatopic and atopic children without asthma across age groups.
| Follow-up clinics | FENO geometric mean (geometric sd) (ppb) | 5th and 95th percentile (ppb) |
| Healthy nonatopic children | ||
| 8 years (n=211) | 8.7 (1.6) | 4.6–16.4 |
| 11 years (n=294) | 8.9 (1.6) | 4.7–20 |
| 13–16 years (n=168) | 13.7 (1.6) | 7–32 |
| 18 years (n=135) | 12.1 (1.6) | 6–27 |
| Atopic children without asthma | ||
| 8 years (n=64) | 15.3 (2.3) | 5.3–57.9 |
| 11 years (n=93) | 17.3 (2.4) | 4.3–70.0 |
| 13–16 years (n=141) | 23.3 (2.2) | 7–90 |
| 18 years (n=114) | 19.7 (2.1) | 7–77 |
As FENO is not normally distributed, the geometric mean and the 5th and 95th percentiles are presented in the table. sd: standard deviation