 Apfel et al have shown that 30-40 of adult patients undergoing surgery have post discharge nausea and or vomiting while 12 have vomiting. These data on nausea in adults were based on a visual analog scale for nausea. There are no data on the incidence of postoperative nausea in children since the severity of symptoms are difficult to measure as younger children are known to be unable to use the VAS reliably. 