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Table 3 Risk of PONV (%) at 0–24 h in relation to PONV risk factors and number of PONV-prophylaxis given

From: Risk of postoperative nausea and vomiting in hip and knee arthroplasty: a prospective cohort study after spinal anaesthesia including intrathecal morphine

  1. Values are risk of PONV (number of patients with PONV in subgroup / total number of patients in subgroup). Grayshaded subgroups are considered given optimal prophylaxis in accordance to the definitions in the study