Table 3.

The ROX, mROX, ROX-HR, and mROX-HR indices predict HFNC success

	HFNC-success (n = 51)	HFNC-failure (n = 24)	p value	OR value	95% CI
Baseline ROX [M(P25, P75)]	7.5 (6.0–10.6)	7.4 (5.4–8.4)	0.061	1.968	0.970–3.994
Baseline mROX [M(P25, P75)]	6.1 (4.3–9.0)	5.2 (4.0–6.5)	0.012	2.631	1.233–5.613
Baseline ROX-HR [M(P25, P75)]	7.6 (5.3–11.7)	6.0 (5.0–7.3)	0.013	3.013	1.259–7.210
Baseline mROX-HR [M(P25, P75)]	6.8 (4.2–9.8)	4.2 (3.4–5.7)	0.005	3.984	1.526–10.402
2 h ROX [mean ± SD]	8.3 ± 2.5	5.4 ± 2.3	0.001	5.954	2.434–14.613
2 h mROX [M(P25, P75)]	8.7 (6.0–12)	3.7 (2.6–5.5)	0.001	10.816	3.373–34.689
2 h ROX-HR [mean ± SD]	8.9 ± 3.7	4.9 ± 2.6	0.001	8.696	2.797–27.038
2 h mROX-HR [M(P25, P75)]	8.9 (5.8–12.6)	3.6 (2.3–4.1)	0.001	15.039	3.758–60.190

Annotation: ROX, SpO₂ /FiO₂ (%) to RR (breaths/min); mROX, PaO₂/FiO₂(%) to RR(breaths/min); ROX-HR,ROX /HR*100; mROX-HR, mROX/HR*100; OR, odds ratio; CI, Confidence interval