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Zubrod-ECOG-WHO score (ZPS, five-grade system)
| Score | Definition |
| 0 | Asymptomatic |
| 1 | Few symptoms, caring for self, able to carry out work of a light nature |
| 2 | With tolerance to cancer-related symptoms, caring for self, < 50% in bed during the day |
| 3 | Severe cancer-related symptoms, > 50% in bed during the day, but not bedbound, capable of only limited self-care |
| 4 | Bedbound |
| 5 | Death |
