| 
 | 无或无明显狭窄 < 30% | ≥30%狭窄 < 70% | 狭窄 ≥ 70% | χ2 | P | 
| 是否迂曲 | 
 | 
 | 
 | 0.692 | 0.708 | 
| 无迂曲 | 11 (16.2%) | 15 (22.1%) | 42 (61.8%) | 
 | 
 | 
| 迂曲 | 11 (17.7%) | 17 (27.4%) | 34 (54.8%) | 
 | 
 |