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Correlation between ACT, APTT, anti-Xa values, and concurrent heparin dosing.
| Correlation coefficient spearman | All | Normal antithrombin level |
|---|---|---|
| APTT vs. anti-Xa | 0.72 (p < 0.001) | 0.80 (p < 0.001) |
| ACT vs. anti-Xa | 0.33 (p < 0.001) | 0.40 (p=0.038) |
| APTT vs. UFH dose | 0.14 (p < 0.100) | 0.62 (p < 0.001) |
| ACT vs. UFH dose | −0.03 (p < 0.740) | 0.16 (p=0.420) |
| Anti-Xa vs. UFH dose | 0.39 (p < 0.001) | 0.57 (p=0.001) |
