Table 3. Validated, simplified PONV prognosis systems for adults and children, stating the risk factors involved and calculated incidences of PONV.
| Prognosis system | Koivuranta et al. (7) | Apfel et al. (1) | Eberhart et al. (12) |
| Patient population | Adults | Adults | Children |
| Risk factors | Female sex | Female sex | Age >3 years |
| Prior history of PONV | History of PONV History of motion sickness | History of PONV or motion sickness in the child or a first-degree relative | |
| Prior history of motion sickness | |||
| Nonsmoker status | Nonsmoker status | Strabismus surgery | |
| Length of operation >60 min | Expected postoperative administration of opioids | Length of operation >30 min | |
| Calculated incidence of PONV with n risk factors present (sum of the risk factors listed above) | |||
| n | % | % | % |
| 0 | 17 | 10 | 9 |
| 1 | 18 | 21 | 10 |
| 2 | 42 | 39 | 30 |
| 3 | 54 | 61 | 55 |
| 4 | 74 | 79 | 70 |
| 5 | 87 | Not stated | Not stated |