There was no statistical significance in primary outcome of prolonging pregnancy by 1 week comparing the 2 groups ( removal 18/32 , 56.3 % ; retention 11/24 , 45.8 % ) P = .59 ; or chorioamnionitis ( removal 8/32 , 25.0 % ; retention 10/24 , 41.7 % ) P = .25 , respectively .