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| Access opening | Pre-obturation | |||
| Negative | Positive | Total | % | |
| Negative | 6 | 0 | 6 | 19.35 |
| Positive | 20 | 5 | 25 | 80.65 |
| Total | 26 | 5 | 31 | 100.00 |
| % | 83.87 | 16.13 | 100.00 | |
| McNemar/chi-squared=18.0501 , P=0.00002* | ||||
| Wilcoxon matched pairs test, Z=3.9199, P=0.00008* | ||||
*P <0.05
