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Table 3 Performance of ultrasound diagnosis of ultrasound interstitial syndrome (UIS) as a marker of bilateral pulmonary opacities consistent with acute respiratory distress syndrome

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

UIS threshold Number of observations (n = 101) Test characteristic 95 % CI
1 lung field bilaterally   Bilateral opacities on chest radiograph    
    Present Absent Sensitivity 86 % 70–95
  UIS Present 30 41 Specificity 38 % 26–51
  Absent 5 25 PPV 42 % 31–55
      NPV 83 % 65–94
Bilateral; 3 lung fields minimum   Bilateral opacities on chest radiograph    
    Present Absent Sensitivity 80 % 63–92
  UIS Present 28 25 Specificity 62 % 49–74
  Absent 7 41 PPV 53 % 39–67
      NPV 85 % 72–94
2 lung fields bilaterally    Bilateral opacities on chest radiograph    
    Present Absent Sensitivity 60 % 42–76
  UIS Present 21 15 Specificity 77 % 65–87
   Absent 14 51 PPV 58 % 41–75
      NPV 79 % 67–88
  1. CI confidence interval, NPV negative predictive value, PPV positive predictive value