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Table 2 Receiver operating characteristic (ROC) curve analysis of the different variables at 8 h (T8) to predict mortality at 30 days

From: Clinical classification of tissue perfusion based on the central venous oxygen saturation and the peripheral perfusion index

Variable

ROC area

95 % CI

Cutoff value

Sensitivity

Specificity

Lactate, mmol/L

0.693*

0.625, 0.756

3.6

35.71

94.83

ScvO2, %

0.669*

0.599, 0.733

70

42.86

83.33

P(v-a) CO2

0.596*

0.525, 0.664

6

42.86

70.11

PI

0.835

0.777, 0.884

0.6

60.71

89.66

  1. P(v-a)CO2, difference between central venous and arterial PCO2 (mmHg), PI peripheral perfusion index measured by pulse oximetry, ScvO2 central venous O2 saturation
  2. *P <0.05 for comparison of PI vs ScvO2, P(v-a) CO2, and lactate