Fig. 4

CrCl (ml/min/1.73m²) and anti-Xa activity (U/ml). Mean values and standard deviation for CrCl (ml/min) and anti-Xa activity (U/ml) categorized into sub-prophylactic anti-Xa activity (<0.2 U/ml), within the recommended prophylactic range (0.2-0.5 U/ml) and had supra-prophylactic (>0.5 U/ml) range