| 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 |