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Table 2 Diagnostic accuracy of a new weaning index (diaphragmatic index) with tidal breathing, during deep breathing and traditional weaning

From: The role of diaphragmatic ultrasound as a predictor of successful extubation from mechanical ventilation in respiratory intensive care unit

Variables Cutoff Sensitivity Specificity PPV NPV AUC p
Traditional weaning
 PaO2/FIO2 >202.5 61% 95% 73% 92% 84% < 0.001
 RR <16.5 72% 70% 34% 92% 80% < 0.001
 MV(L/m) <8.7 42% 90% 47% 87% 68% 0.01
 RSBI <35.5 47% 90% 51% 188% 71% < 0.001
During tidal breathing
 DT Insp > 21 95% 100% 100% 99% 95% < 0.001
 DT Exp (FRC) >15.5 62% 100% 100% 92% 85% < 0.001
 DTF% >32.82 90% 75% 44% 97% 77% < 0.001
 DE >1.7 68% 65% 30% 90% 73% < 0.001
During deep breathing
 DT Insp (TLC) >28.5 100% 65% 39% 100% 87% < 0.001
 DT Exp (RV) >22.5 73% 75% 39% 93% 75% < 0.001
 DTF % >37 97% 100% 100% 99% 100% < 0.001
 DE >3.1 75% 55% 27% 91% 68% 0.01
  1. PPV positive predictive value, NPV negative predictive value, AUC area under a curve, p is considered significant if < 0.05