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Table 3 Comparisons in predictive power between ROX index, PaO2/FiO2, and PaO2/FiO2/RR

From: Prediction of noninvasive ventilation failure using the ROX index in patients with de novo acute respiratory failure

 

AUC (95% CI)

pa

pb

Before NIV

 ROX index

0.64 (0.61–0.67)

0.10

0.47

 PaO2/FiO2

0.61 (0.58–0.64)

 PaO2/FiO2/RR

0.65 (0.62–0.67)

After 1–2 h NIV

 ROX index

0.71 (0.68–0.74)

0.84

0.02

 PaO2/FiO2

0.71 (0.68–0.73)

 PaO2/FiO2/RR

0.74 (0.71–0.76)

After 12 h NIV

 ROX index

0.74 (0.71–0.77)

0.14

0.41

 PaO2/FiO2

0.72 (0.69–0.74)

 PaO2/FiO2/RR

0.75 (0.73–0.78)

After 24 h NIV

 ROX index

0.77 (0.74–0.80)

0.26

0.47

 PaO2/FiO2

0.75 (0.72–0.78)

 PaO2/FiO2/RR

0.78 (0.75–0.81)

  1. NIV noninvasive ventilation, ROX ratio of SpO2/FiO2 to respiratory rate, AUC area under the receiver operating characteristics curve, CI confidence interval, RR respiratory rate
  2. aROX index vs. PaO2/FiO2
  3. bROX index vs. PaO2/FiO2/RR