Table 5

Comparison of the ROX index and CURB-65 in predicting mortality

Se (%)Sp (%)PPV (%)NPV (%)LR+LR−AUROC95% CIP value
ROX index from SpO275.746.814.394.21.420.520.640.57 to 0.70<0.001
CURB-6583.054.217.596.41.810.310.760.71 to 0.81<0.001
  • AUROC, area under the curve of receiver operating characteristics; CURB-65, confusion, urea level, respiratory rate, systolic or diastolic blood pressure, 65 years or older; LR−, likelihood ratio of a negative test; LR+, likelihood ratio of a positive test; NPV, negative predictive value; PPV, positive predictive value; ROX index, Respiratory rate-OXygenation index; Se, sensitivity; Sp, specificity; SpO2, oxygen saturation by pulse oximetry.