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Table 5 Diagnostic indices of the ROX index at the recommended (4.88) and optimal (4.75) cut-points

From: ROX index versus HACOR scale in predicting success and failure of high-flow nasal cannula in the emergency department for patients with acute hypoxemic respiratory failure: a prospective observational study

Time

ROX index

Sensitivity (%)

Specificity (%)

PPV (%)

NPV (%)

Accuracy

LR + 

LR-

1 h

 > 4.88

84.62

43.48

77.19

55.56

72.0

1.50

0.35

 > 4.75

90.38

43.48

78.33

66.67

76.0

1.60

0.22

2 h

 > 4.88

90.38

43.48

78.33

66.67

76.0

1.60

0.22

 > 4.75

94.23

43.48

79.03

76.92

78.67

1.67

0.13

6 h

 > 4.88

92.98

61.11

88.33

73.33

85.33

2.39

0.11

 > 4.75

92.98

61.11

88.33

73.33

85.33

2.39

0.11

  1. Abbreviations: PPV Positive predictive value, NPV Negative predictive value, LR Likelihood ratio
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International Journal of Emergency Medicine

ISSN: 1865-1380

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