| 年度 | 术前30 min | 术后 | χ2 | P |
| 2013 | 73 (63.48%) | 42 (36.52%) | 4.385 | |
| 2014 | 19 (86.36%) | 3 (13.64%) |
| 0.282b |
| 2015 | 11 (100.00%) | 0 |
| |
| 2016 | 14 (93.33%) | 1 (6.67%) |
| 0.577d |
| 2017 | 20 (90.91%) | 2 (9.09%) |
| 0.644 e |
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