The impact of chorionicity on pregnancy outcome and neurodevelopment at 2 years old among twins born preterm: the EPIPAGE‐2 cohort study

Objective To compare the short‐ and mid‐term outcomes of preterm twins by chorionicity of pregnancy. Design Prospective nationwide population‐based EPIPAGE‐2 cohort study. Setting 546 maternity units in France, between March and December 2011. Population A total of 1700 twin neonates born between 24 and 34 weeks of gestation. Methods The association of chorionicity with outcomes was analysed using multivariate regression models. Main outcome...