Inclusion Criteria:  Adult woman (≥18 years old) Patient who underwent induction of labor between February 1, 2020 and February 29, 2021 Patient not having expressed her opposition, after information, to the reuse of her data for the purposes of this research.  Exclusion Criteria:  Patient who expressed her opposition to participating in the study Absence of prior cervical maturation (Bishop score greater than or equal to 6 on the day of initiation) Gestational age less than 37 weeks, multiple pregnancy, scarred uterus, non-cephalic presentation, death in utero and severe fetal malformation (requiring neonatal resuscitation or with a palliative care plan) Patient for whom the triggering method was chosen by the practitioner Patient under guardianship, curatorship or safeguard of justice