Table 1 General characteristics at ICU admission

Characteristics

 Age in years, mean (SD)

 Sex, male, n (%)

 BMI, mean (SD)

 Admission type, n (%)^a

  Medical

  Acute surgery

  Other^b

 Illness severity scores, mean (SD)

  APACHE II

  APACHE IV

  SAPS II

Comorbidities

 Chronic heart failure, n (%)

 Chronic renal impairment, n (%)

 Liver disease, n (%)

 Respiratory disease, n (%)

 Diabetes mellitus, n (%)

 Any previous venous thrombotic event, n (%)

 Venous thrombotic event in previous 3 months, n (%)

 Venous thrombotic event in previous 24 h, n (%)

 Therapeutic anticoagulation prior to current hospital admission, n (%)