Socio-demographic characteristics of the exposed and the unexposed women.

<p>Socio-demographic characteristics of the exposed and the unexposed women.</p

Associations of extensive ibuprofen exposure with gestational age according to duration of exposure.

<p>All values are given in days.</p

Associations of ibuprofen with gestational age according to timing of exposure.

<p>All values are given in days.</p

Medical characteristics of the exposed and the unexposed women.

<p>Medical characteristics of the exposed and the unexposed women.</p

The fixed effects model.

<p>The β coefficient gives an estimate of the difference between exposed and non-exposed sibling clusters.</p

Associations of ibuprofen with birth weight according to timing of exposure.

<p>All values are given in grams.</p

Population flow diagram.

<p>MoBa: Norwegian Mother and Child Cohort Study.</p> <p>NSAIDs: Nonsteroidal antiinflammatory drugs.</p