Table 5.
Risk factors for respiratory disease of infants during Phase 1 of the BILD cohort
| Number of infants | Proportion of infants (%) | |
|---|---|---|
| History of maternal asthma | ||
| Negative | 320 | 88.6 |
| Positive | 39 | 10.8 |
| Unknown | 2 | 0.6 |
| History of paternal asthma | ||
| Negative | 323 | 89.0 |
| Positive | 36 | 9.9 |
| Unknown | 4 | 1.1 |
| History of maternal atopic disease a | ||
| Negative | 233 | 64.2 |
| Positive | 126 | 34.7 |
| Unknown | 4 | 1.1 |
| Skin-pick test results in mothers b | ||
| Negative | 197 | 65.0 |
| Positive | 106 | 35.0 |
| Maternal smoking during pregnancy | ||
| Negative | 316 | 87.5 |
| Positive | 42 | 11.6 |
| Unknown | 3 | 0.8 |
| Paternal smoking during pregnancy | ||
| Negative | 280 | 77.1 |
| Positive | 76 | 20.9 |
| Unknown | 7 | 1.9 |
| Older siblings | ||
| None | 181 | 50.1 |
| One | 114 | 31.6 |
| More than one | 58 | 16.1 |
| Unknown | 8 | 2.2 |
This Table shows the distribution of risk factors for respiratory disease of study participants during Phase 1 of the BILD cohort, i.e. during the first year of life (n = 364, information could not be retrieved for 3 out of 14 drop-outs during Phase 1).
aEither maternal history of allergic rhinitis, allergic asthma or atopic dermatitis.
bSkin-prick tests were performed in a subgroup of 303 mothers. Tests were positive in case of hives bigger than positive control (histamine) in any of the tested common allergens.