Variables used to predict asthma symptoms
| Clinical symptoms (n=848) | n/N | (%) |
| Allergic mother | 567/848 | (67) |
| Wheezing in fourth year of life | ||
| Infrequent (1–3 times/year) | 179/848 | (21) |
| Frequent (>3 times/year) | 64/848 | (8) |
| Doctor's diagnosis of eczema | 388/848 | (46) |
| Objective tests | Median (range) | IQR |
| FENO in ppb (n=306) | 9.05 (2.40–45.9) | 6.30 |
| 10log-transformed FENO | 0.96 (0.38–1.66) | 0.29 |
| Rint in kPa/l (n=482) | 0.93 (0.14–1.99) | 0.32 |
| n/N | (%) | |
| Positive specific IgE | 102/380 | (27) |
FENO, fraction of exhaled nitric oxide; IgE, immunoglobulin E; Rint, interrupter resistance.