RESULTS	Compared to placebo , PONV over the whole 24 h observation period was significantly reduced by droperidol ( Fig. 3 ; P = 0.0338 ) : completely free from PONV : placebo : 41.3 % , 0.625 mg droperidol : 67.4 % , 1.25 mg droperidol : 53.2 % , 2.5 mg droperidol : 71.7 % .\