Table 5.

Predictive values of the ROX, mROX, ROX-HR, and mROX-HR indices for COVID-19 pneumonia and non-COVID-19 patients

Indices	COVID-19 pneumonia		Non-COVID-19		P value
	AUROC	95% CI	AUROC	95% CI
2 h ROX	0.911	0.732–0.986	0.756	0.612–0.867	0.1514
2 h mROX	0.952	0.790–0.998	0.806	0.668–0.905	0.0749
2 h ROX-HR	0.958	0.799–0.999	0.775	0.633–0.882	0.0523
2 h mROX-HR	0.958	0.799–0.999	0.82	0.684–0.915	0.0742

Annotation: AUROC, area under the receiver operating characteristic curve; CI: confidence interval; ROX, SpO₂ /FiO₂ (%) to RR (breaths/min); mROX, PaO₂/FiO₂(%) to RR (breaths/min); ROX-HR, ROX/HR*100; mROX-HR, mROX /HR*100