| NAS (0~8分) | 肝细胞脂肪变性 | <5% | 0 |
| 5%~33% | 1 | ||
| 34%~66% | 2 | ||
| >67% | 3 | ||
| 小叶内炎症 (200倍镜下计数坏死灶) | 无 | 0 | |
| <2 | 1 | ||
| 2-4 | 2 | ||
| >4 | 3 | ||
| 肝细胞气球样变 | 无 | 0 | |
| 少见 | 1 | ||
| 多见 | 2 |