Age of child (months)/separate surveys | <1½ | 1½ | 3 | 5 and 7 | 12 | 16 | 24, 36 and 48 | 60 |
Informed consent | X | X | ||||||
Family background (confounder) | X | |||||||
Decision-making | X | X | ||||||
Vaccination and health status (group definition, confounder, endpoints) | X | X | X | X | X | X | ||
Allergy questionnaire (endpoints) | X | X | X | |||||
Closing—family background (confounder) | X | |||||||
Optional: further laboratory investigations | (X) |