Association between induction of labor and risk of PPH and severe PPH among low-risk primiparas, multivariable analyses*.

*6 multileveled logistic regression models with random intercept.**3 models adjusted for maternal age, parity, epidural analgesia, duration of active phase of labor, mode of delivery, episiotomy/perineal tears, prophylactic oxytocin after birth and birth weight.***3 models adjusted for maternal age, parity, epidural analgesia, duration of active phase of labor, mode of delivery, episiotomy/perineal tears, prophylactic oxytocin after birth, birth weight and % of PPH with no documented Hb delta (level 2 covariable)