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Table 2 Performance of SpO2/FiO2 as a marker of PaO2/FiO2 when SpO2 ≤ 97 %

From: Pulmonary ultrasound and pulse oximetry versus chest radiography and arterial blood gas analysis for the diagnosis of acute respiratory distress syndrome: a pilot study

Number of observations (n = 43) Test characteristic 95 % CI
   PaO2/FiO2    
   ≤300 >300 Sensitivity 83 % 68–93
SpO2/FiO2 ≤315 34 1 Specificity 50 % 1–99
>315 7 1 PPV 97 % 85–100
     NPV 13 % 0–53
   PaO2/FiO2    
   ≤200 >200 Sensitivity 70 % 47–87
SpO2/FiO2 ≤235 16 2 Specificity 90 % 68–99
>235 7 18 PPV 89 % 65–99
     NPV 72 % 51–88
  1. CI confidence interval, FiO2 fraction of inspired oxygen, NPV negative predictive value, PaO2 partial pressure of oxygen, PPV positive predictive value, SpO2 pulse oximetric oxygen saturation