Pessary placement in the prevention of preterm birth in multiple pregnancies: a propensity score analysis.

Objective: In asymptomatic women with a multiple pregnancy and short cervix prophylactic use of a cervical pessary might reduce preterm birth. We assessed the possible treatment effects of pessary use in pregnancy duration and for poor perinatal outcome.

Study Design: This cohort study was performed between December 2012 and September 2014 in 44 hospitals in the Netherlands.