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Table 1 Variables that potentially act as confounder factors

From: Lactate clearance as a simple bedside instrument to predict short-term mortality of severe septic patients

Variable

Nonsurvivors

Survivors

Pvalue

Adjusted HR (95% CI)

HR change (%)

Septic shock within 6 hours

     

   With septic shock

11

4

0.081

3.083 (1.505 to 6.317)

7.4

   Without septic shock

23

22

   

Initial SOFA score

     

   >9

11

3

0.038

2.919 (1.388 to 6.138)

1.7

   ≤9

19

21

   

Vasoactive drugs within 6 hours

     

   Without vasoactive drugs

22

23

0.013

2.988 (1.462 to 6.106)

4.1

   With vasoactive drugs

12

3

   

Invasive ventilation within 6 hoursa

     

   Without mechanical ventilation

31

23

0.777

-

-

   With mechanical ventilation

3

3

   

PRC transfusion within 6 hours

     

   Without transfusion

29

25

0.069

3.077 (1.493 to 6.340)

7.2

   With transfusion

5

1

   

Fluid resuscitation within 6 hours

     

   <1,000 cm3

15

18

0.166

2.942 (1.444 to 5.994)

2.5

   ≥1,000 cm3

19

8

   
  1. HR, hazard ratio; SOFA, Sequential Organ Failure Assessment; PRC, packed red cells. aInvasive ventilation parameter not included in multivariate analysis, because P < 0.25.