| 组 | Dx | Sd | LSD-t | P-值 | 
| 0d-180d | 144 | 2.260777 | 63.69493 | 1.007E−09 | 
| 0d-420d | 66 | 2.260777 | 29.19351 | 1.071E−07 | 
| 180d-420d | 78 | 2.260777 | 34.50142 | 3.95E−08 |