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Components of the new scoring system.
| Variable | Level | Score |
|---|---|---|
| χ1：Child–Pugh grade | A | 1 |
| B–C | 2 | |
| χ2：Medical diseases requiring drug treatment | No | 1 |
| Yes | 2 | |
| χ3：Extent of resection | Minor hepatectomy | 1 |
| Major hepatectomy | 2 | |
| χ4：Adjacent organ invasion | No | 1 |
| Yes | 4 | |
| χ5：Preoperative hospital stay (days) | ≤7 | 1 |
| >7 | 2 |
Note: the total score was calculated by summing the scores for the five individual variables.
