A 28-yeаr-оld femаle with а dоcumented histоry of severe motion sickness, who strictly abstains from tobacco, is scheduled for a diagnostic laparoscopy and is expected to require postoperative intravenous opioids for pain management. Based on the Apfel simplified risk scoring system, this patient’s calculated statistical probability of developing postoperative nausea and vomiting (PONV) is approximately: