We found no differences in nausea or vomiting at 30 min and 2 h postoperatively ; we found no difference in the incidence of nausea between dexamethasone-haloperidol and dexamethasone-placebo groups at 6 h [ relative risk ( RR ) 0.82 , 95 % confidence interval ( CI ) 0.56-1 .25 ] and 24 h ( RR 0.79 , 95 % CI 0.56-1 .1 ) , but the cumulative incidence of vomiting in the dexamethasone-haloperidol group was significantly lower at 6 h ( RR 0.57 , 95 % CI 0.39-1 .05 ) and 24 h ( RR 0.54 , 95 % CI 0.31-0 .86 ) .
