Overall , 84 of 302 ( 27.8 % ) women were undelivered at 12 hours , comprising 37.0 % ( 95 % CI 28.7-47 .8 ) oral , 20.5 % ( 95 % CI 14.0-30 .1 ) vaginal , and 21.0 % ( 95 % CI 14.3-30 .7 ) sublingual groups .