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Table 1 Baseline characteristics of patients in regression analysis

From: Red blood cell transfusion and increased length of storage are not associated with deep vein thrombosis in medical and surgical critically ill patients: a prospective observational cohort study

Characteristic

All (n= 241)

RBCs (n= 117)

No RBCs (n= 124)

P value

Age in years, mean (SD)

66.4 (15.2)

68.8 (13.3)

64.1 (16.5)

0.02

Females, number (percentage)

93 (38.6)

55 (47.0)

38 (30.7)

0.009

APACHE II score, mean (SD)

25.5 (8.4)

26.8 (8.3)

24.2 (8.3)

0.02

Multiple organ dysfunction score, mean (SD)

6.3 (3.9)

7.6 (3.8)

5.1 (3.6)

< 0.001

Height in centimeters, mean (SD)

168.7 (10.7)

166.7 (11.4)

170.5 (9.7)

0.007

Weight in kilograms, mean (SD)

76.5 (19.6)

75.4 (19.3)

77.7 (19.9)

0.37

Body mass index in kg/m2, mean (SD)

27.1 (7.2)

27.4 (7.9)

26.8 (6.4)

0.53

Medical admission, number (percentage)

183 (75.9)

75 (64.1)

108 (87.1)

< 0.001

Primary admission diagnosis category, number (percentage)

    

   Pulmonary

89 (36.9)

31 (26.5)

58 (46.8)

< 0.001

   Cardiovascular

62 (25.7)

37 (31.6)

25 (20.2)

 

   Gastrointestinal

37 (15.4)

24 (20.5)

13 (10.5)

 

   Renal

17 (7.1)

12 (10.3)

5 (4.0)

 

   Neurological

16 (6.6)

2 (1.7)

14 (11.3)

 

   Sepsis

12 (5.0)

7 (6.0)

5 (4.0)

 

   Othera

8 (3.3)

4 (3.4)

4 (3.2)

 

Location prior to admission, number (percentage)

    

   Ward

106 (44.0)

53 (45.3)

53 (42.7)

0.002

   Emergency room

60 (24.9)

18 (15,4)

42 (33.9)

 

   Operating room

36 (14.9)

25 (21.4)

11 (8.9)

 

   Other hospital ICU

39 (16.2)

21 (18.0)

18 (14.5)

 

Central venous catheter, number (percentage)

206 (85.5)

110 (94.0)

96 (77.4)

< 0.001

Mechanical ventilation, number (percentage)

218 (90.5)

110 (94.0)

108 (87.1)

0.07

Days of mechanical ventilation, median (IQR)

7 (3, 15)

12 (6, 23)

4 (2, 9)

< 0.001

Days in ICU, median (IQR)

10 (6, 20)

16 (8, 26)

8 (5, 13)

< 0.001

ICU mortality, number (percentage)

66 (27.4)

40 (34.2)

26 (21.0)

0.02

Days in hospital, median (IQR)

25 (13, 54)

30 (15, 64.5)

19 (11, 41)

0.002

Hospital mortality, number (percentage)

94 (39.0)

55 (47.0)

39 (31.5)

0.01

  1. The clinical characteristics of 241 medical-surgical critically ill patients who underwent twice-weekly lower extremity ultrasounds to screen for proximal deep vein thrombosis and who were included in the regression analysis are shown. a'Other' refers to necrotizing fasciitis (3), diabetic ketoacidosis (1), facial surgery (1), Addison disease (1), mushroom poisoning (1), and post-partum hemorrhage (1). APACHE II, Acute Physiology and Chronic Health Evaluation II; ICU, intensive care unit; IQR, interquartile range; RBC, packed red blood cell unit; SD, standard deviation.