The estimations are made by applying a standardisation technique of rates, permitting the joint distribution of deliveries in France according to the geographical situation and the type of centre. The distribution model is the distribution of deliveries in France according to the geographical situation and the type of centre, established from 1999 SAE statistics (Statistiques d'activité des établissements – hospital activity statistics ) (last updating by the DREES in 2017). This technique consists in assigning a weight to each pregnancy so that the distribution of deliveries according to the type of centre and to the geographical situation is the same in our sample than in all France. This method allows us to obtain perinatal health parameters values valid at a national scale. Previously, this technique had already proved its validity thanks to the comparison of our results with those of the French DGS-INSERM (U 149) surveys carried out in 1995 and 1998.