NPPB and chronic kidney disease: Table 4 presents the cross-tabulation of categorical demographic variables and treatment. There was no statistically significant relationship between treatment and sex (p = 0.939), troponin level at admission (p = 0.740), BNP level at admission (p = 0.931), history of malignancy (p = 0.590), chronic renal insufficiency (p = 0.313), chronic liver disease (p = 0.105), chronic pulmonary disease (p = 0.612), or history of previous VTE (p = 0.631).