N | Model 1 OR (95% CI) | Model 2 OR (95% CI) | |
---|---|---|---|
Unexposed children (at least one sibling has been prenatally exposed) | 5957 | 1.00 (ref) | 1.00 (ref) |
Exposed children (at least one sibling has been prenatally unexposed) | 4542 | 1.12 (1.00 to 1.24) | 1.11 (0.98 to 1.25) |
Model 1: the estimate is adjusted for birth year (1996–2000, 2001–2005, 2006–2009).
Model 2: the estimate is additionally adjusted for maternal age, maternal smoking status, maternal use of medication (paracetamol, proton-pump inhibitors, cyclooxygenase inhibitors, antibiotics), mode of delivery, gestational age, birth order, birth weight, gender and birth year.