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Comparisons of 28-day in-hospital mortality rates between the groups
| Control | Antithrombin | Difference (95% CI) | P value | |
|---|---|---|---|---|
| Unmatched groups | 13.5% (415/3071) | 39.5% (60/152) | −26.0% (−31.7 to −20.2) | <0.001 |
| Propensity-matched groups | 47.6% (49/103) | 33.0% (34/103) | 14.7% (1.2 to 28.0) | 0.03 |
