Pre-induction values of exhaled nitric oxide fraction (FeNO) and of functional indices
| Controls | Rhinitis | Asthma | p-value controls–rhinitis | p-value controls–asthma | p-value rhinitis–asthma | |
| FEV1 % pred | 104.9±11.4 | 103.7±13.2 | 98.9±12.1 | 0.804 | 0.153 | 0.190 |
| FeNO ppb | 9.9 (6.1–16) | 36.2 (19.3–68.1) | 43.2 (19.4–96.5) | <0.001 | <0.001 | 0.359 |
| SHe %·L−1 | 1.28±0.54 | 1.34±0.62 | 2.29±1.96 | 0.774 | 0.027 | 0.058 |
| SSF6 %·L−1 | 1.84±0.94 | 2.21±0.96 | 2.83±1.05 | 0.108 | 0.004 | 0.232 |
Data are presented as mean±sd or geometric mean (geometric interval) (geometric mean is antilog(mean) and geometric interval is (antilog(mean–sd) – antilog(mean+sd)) of the log-transformed FeNO), unless otherwise stated. FEV1: forced expiratory volume in 1 s; S: slope; He: helium; SF6: sulfur hexafluoride.