Table 3– Sensitivity, specificity, likelihood ratios and predictive values of three titrated oxygen requirements for the prediction of death at 1 yr
Sensitivity %Specificity %LR+LR-Pre-test probability 10%Pre-test probability 50%Pre-test probability 90%
PPV %NPV %PPV %NPV %PPV %NPV %
Derivation cohort
 ≥1 L·min−189622.340.18219870859539
 ≥6 L·min−144894.000.63319380619715
 15 L·min−122943.670.83299279559712
Validation cohort
 ≥1 L·min−181451.460.43149559709320
 ≥6 L·min−155863.960.52319580669718
 ≥15 L·min−1399.23.890.98309080519710
  • LR+: positive-likelihood ratio; LR-: negative-likelihood ratio; PPV: positive predictive value; NPV: negative predictive value.