Item | 2017(n/%) | 2018(n/%) | χ2 | P |
---|---|---|---|---|
Operation check is not standard | 250(38.22) | 70(12.61) | 101.202 | < 0.001 |
Incomplete explanation to patients | 113(51.83) | 32(17.30) | 51.279 | < 0.001 |
The use of micro pump is not standard | 106(48.62) | 50(27.03) | 19.674 | < 0.001 |
The extraction method is not standard | 84(38.53) | 52(28.11) | 4.864 | 0.027 |
Operation timeout | 82(37.61) | 127(68.64) | 38.606 | < 0.001 |