Comparison of the median duration of labor in cases of severe postpartum hemorrhage versus controls, n = 2614.

<p>Comparison of the median duration of labor in cases of severe postpartum hemorrhage versus controls, n = 2614.</p

Multivariable analysis on the association between duration labor >12 hours and severe postpartum hemorrhage, n = 2614.

<p>Multivariable analysis on the association between duration labor >12 hours and severe postpartum hemorrhage, n = 2614.</p

Gradient effect of the duration of labor on severe postpartum hemorrhage, n = 2614.

<p>Adjusted for augmentation with oxytocin, induction of labor, primiparity, and fever during labor. OR = odds ratio; CI = confidence interval.</p

Clinical profile of the study population, n = 2614.

<p>Clinical profile of the study population, n = 2614.</p