Predictive value of diaphragm ultrasound for mechanical ventilation outcome in patients with acute exacerbation of chronic obstructive pulmonary disease

Table 3 Predictive efficacy of potential of hydrogen, partial pressure of carbon dioxide, and diaphragm thickening fraction for non-invasive ventilation outcomes in patients with acute exacerbation of chronic obstructive pulmonary disease

Index	AUC	95%CI	P value	Sensitivity	Specificity
pH	0.690	0.576-0.804	0.005	0.885	0.500
PaCO2	0.833	0.745-0.920	< 0.001	0.923	0.691
DTF	0.873	0.793-0.953	< 0.001	0.808	0.809

pH: Potential of hydrogen; PaCO2: Partial pressure of carbon dioxide; DTF: Diaphragm thickening fraction; AUC: Area under curve; CI: Confidence interval.