| R-L grade/case |
| |||
Group | Grade 0 | Grade I | Grade II | Grade III | Percentage of grade 0~I |
A | 8 | 13 | 3 | 0 | 21 (87.5%) |
B | 4 | 10 | 10 | 0 | 14 (58.3%) |
χ2 | - | - | - | - | 5.169 |
P value | - | - | - | - | 0.023 |