| Pregnancy test | ABS | |
| Normal ABS* < 30% | Abnormal ABS* > 30% | |
| Positive result | 24 | 17 |
| Negative result | 1 | 69 |
| Total | 25 | 86 |
| Statistical analysis | X2 = 0.0001 DF = 1 p < 0.05 | |