Table 3.

Independent risk factors for aFXa <0.1 U/ml at 4 hours after injection of standard certoparin dosages

	Binary model			Bivariate model
	OR	95% CI	P-value	Patients below antithrombotic range	Patients within antithrombotic range	P-value
Vasopressor requirement (n/%)	0.348	0.07–1.66	0.185	18/38 (47.4)	5/24 (20.8)	0.038
Antithrombin at baseline (%)	0.910	0.86–0.97	0.002	66 ± 11	86 ± 18	<0.001
Serum creatinine at baseline (mg/dl)	0.302	0.96–1.01	0.302	1.19 ± 0.57	1.7 ± 1.16	0.027
Serum urea at baseline (mg/dl)	0.630	0.17–2.39	0.497	57 ± 34	88 ± 44	0.004

Data are given as mean values ± standard deviation, if not indicated otherwise. aFXa, antiFactor Xa activity; CI, confidence interval; OR, odds ratio.