Satisfaction with treatment was reported by 54.1 % ( 95 % CI 43.5 % to 64.5 % ) , 61.6 % ( 95 % CI 51.0 % to 71.4 % ) , and 59.5 % ( 95 % CI 48.4 % to 69.9 % ) for ondansetron , metoclopramide , and placebo , respectively ; rescue medication was required by 34.5 % ( 95 % CI 25.0 % to 45.1 % ) , 17.9 % ( 95 % CI 10.8 % to 27.2 % ) , and 36.3 % ( 95 % CI 26.3 % to 47.2 % ) , respectively .