The incidences of PONV were lower ( nausea , 14 % vs. 59 % and 41 % , respectively ; P < 0.001 ; vomiting , P = 0.048 ) and the incidence of complete response was higher ( 83 % vs. 37 % and 59 % , respectively ; P < 0.001 ) in group C than in groups A and B at 48h postoperatively .