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Cox proportional hazards survival analysis in the prediction of amniocentesis-to-delivery interval
| Covariates | Hazard ratio | 95% Confidence interval | P |
|---|---|---|---|
| Elevated amniotic fluid thrombin antithrombin III complexes concentration* | 1.5 | 1.07–2.1 | 0.02 |
| Gestational age at amniocentesis | 0.98 | 0.93–1.03 | 0.45 |
| Cervical dilatation at amniocentesis | 1.3 | 1.2–1.4 | <0.001 |
Variable was dichotomized: amniotic fluid thrombin antithrombin III complex concentration (<108.24 μg/L vs. ≥ 108.24 μg/L).
