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Table 4 CImax cut-off levels for prediction of EtCO2 levels above different thresholds

From: Correlation between end-tidal carbon dioxide and the degree of compression of heart cavities measured by transthoracic echocardiography during cardiopulmonary resuscitation for out-of-hospital cardiac arrest

EtCO2 (mmHg)CImax cut-off level (%)Best Youden’s indexSensitivity (%)Specificity (%)Positive predictive valueNegative predictive value
> 1515.250.95295.2100.0100.083.3
> 2017.351.000100.0100.0100.0100.0
> 2535.920.742100.074.274.272.4