[Prematurity due to medical decisions. Analysis of a retrospective study of 18 maternity hospitals in the periphery of Paris].

We have analysed induced prematurity in a retrospective study of 18 maternity hospitals located in the area of Paris: the Ile-de-France. The rate of induced prematurity was 1.4%, whereas the total rate of prematurity in our study was of 4.6% for a total number of 16,337 deliveries. The great majority of those medically induced prematurity was decided at and after 33 weeks, and the main cause was intrauterine growth retardation. Caesarean section was performed in 60% of the cases.