External validation of the HACOR score and ROX index for predicting treatment failure in patients with coronavirus disease 2019 pneumonia managed on high-flow nasal cannula therapy: a multicenter retrospective observational study in Japan

Table 3 The area under the receiver operating characteristic curve of each predictions

Time point	HACOR score AUROC (95% CI)	ROX index AUROC (95% CI)	P-value* (HACOR versus ROX)
2 h	0.63 (0.54 to 0.71)	0.57 (0.51 to 0.64)	0.24
6 h	0.58 (0.49 to 0.68)	0.62 (0.55 to 0.69)	0.045
12 h	0.70 (0.62 to 0.78)	0.68 (0.62 to 0.75)	0.37
24 h	0.68 (0.58 to 0.78)	0.69 (0.61 to 0.77)	0.63
48 h	0.75 (0.64 to 0.86)	0.75 (0.65 to 0.85)	0.84

AUROC: the area under the receiver operating characteristic curve; CI: confidence interval
*Delong test

ISSN: 2052-0492