| 组别 | I | II | III | IV | 心功能良好率 |
| 观察组 | 34 | 8 | 2 | 1 | 93.33% |
| 对照组 | 28 | 9 | 6 | 2 | 82.22% |
| X2 |
|
|
|
| 10.524 |
| p |
|
|
|
| 0.000 |