Table 2. Characteristics of the study populations.
| Cross-Sectional Cohort (n = 1029) | Birth Cohort (n = 249) | |
|---|---|---|
| Boys, n (%) | 483 (47) | 125 (50) |
| History of allergya, n (%) | ||
| Mother | 498 (48) | 110 (44) |
| Father | 399 (39) | 90 (36) |
| Parent with a university degree, n (%) | ||
| Mother | 321 (31) | – |
| Father | 277 (28) | – |
| Number of pets | ||
| 0 | 767 | 181 |
| 1 | 165 | 40 |
| 2 | 64 | – |
| ≥2 | – | 28 |
| 3 | 21 | – |
| 4 | 7 | – |
| ≥5 | 2 | – |
| Children with allergy, n (%) | ||
| Ever | 481 (47) | 95 (38) |
| In the last year | 314 (31) | 73 (29) |
aIn the cross-sectional study: A history of asthma or allergic rhinoconjunctivitis ever. In the birth-cohort study, a doctor’s diagnosis of asthma, allergic rhinoconjunctivitis, or eczema.