Characteristics at birth and in the first years of life in children with complete data on the course of wheeze from birth to age 13 yrs compared with children with incomplete data on the course of wheeze
| Children with complete data on the course of wheeze from birth to age 13 yrs (study population) | Children with incomplete data on the course of wheeze from birth to age 13 yrs | Children with complete data on the course of wheeze up to age 3 yrs, but with incomplete data on the course thereafter | |
| Subjects n | 441 | 873 | 515 |
| Data collected at birth | |||
| Parental history of atopy | 240/440 (54.5) | 443/867 (51.1) | |
| Male sex | 234/441 (53.1) | 450/873 (51.5) | |
| Elevated cord blood IgE (≥0.9 kU·L−1) | 75/421 (17.8) | 166/840 (19.8) | |
| ≥1 older sibling | 194/441 (44.9) | 399/872 (45.8) | |
| Parental smoking | 161/403 (39.9) | 411/787 (52.2)*** | |
| Higher level of parental education | 240/422 (56.9) | 423/807 (52.4) | |
| Data collected in the first years of life | |||
| Early atopic dermatitis ≤2yrs | 108/441 (24.5) | 104/515 (20.2) | |
| Early wheeze ≤3 yrs | 126/441 (28.6) | 173/515 (33.6) | |
| Atopic sensitisation age 2 yrs (ImmunoCAP class I) | 67/283 (23.7) | 87/318 (27.4) | |
| Breastfed ≥4 weeks | 347/439 (79.0) | 370/510 (72.5)* |
Data are presented as n/n total (%), unless otherwise stated. Ig: immunoglobulin. *: p<0.05 compared with children with complete data on the course of wheeze up to age 13 yrs; ***: p<0.001 compared with children with complete data on the course of wheeze up to age 13 yrs.