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Receiver operating characteristic analysis of OSI to determine effectiveness in a positive pregnancy and clinical pregnancy.
| Cut-off value | Sensitivity | Specificity | AUC (95% CI) | p | |
| Positive pregnancy | 7.8406 | 0.558 | 0.735 | 0.662 (0.598–0.727) | <0.0001 |
| Clinical pregnancy | 8.8894 | 0.472 | 0.761 | 0.636 (0.577–0.695) | <0.0001 |
