Female | 1780/3687 (48.3) |
Maternal asthma and/or hay fever | 881/3652 (24.1) |
Paternal asthma and/or hay fever | 911/3658 (24.9) |
Dutch nationality | 3190/3521 (90.6) |
High maternal education | 1298/3678 (35.3) |
High paternal education | 1458/3637 (40.1) |
Breastfeeding (≥12 weeks) | 1627/3463 (47.0) |
Older siblings | 1860/3678 (50.6) |
Daycare centre attendance# | 2040/3538 (57.7) |
Mother smoked during pregnancy | 626/3652 (17.1) |
Smoking at child's home¶ | |
Early life+ | 912/3686 (24.7) |
Age 20 years | 186/2127 (8.7) |
Active smoking at least once a week§ | |
Age 14 years | 119/2431 (4.9) |
Age 20 years | 426/2127 (20.0) |
Use of natural gas for cooking | |
Early life+ | 3028/3674 (82.4) |
Age 20 years | 1564/2127 (73.5) |
Mould/damp spots in participant's home | |
Early life+ | 300/3643 (8.2) |
Age 20 years | 242/2127 (11.4) |
Furry pets in participant's home | |
Early life+ | 1720/3677 (46.8) |
Age 20 years | 877/2127 (41.2) |
Change of address between birth and most recent follow-up | 2637/3687 (71.5) |