| E/A | Non D.D (No. = 115) | D.D (No. = 35) | Chi-square test | |||
| No. | % | No. | % | X2 | P-value | |
| Normal | 115 | 100.0% | 0 | 0.0% | 30.000 | <0.001 |
| Reversed | 0 | 0.0% | 35 | 100.0% | ||