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. 2021 Sep 30;11(10):989. doi: 10.3390/jpm11100989

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Comparison of ROX index and SpO₂/FiO₂ ratio before 2 h of intubation (a) ROX index, 5.74 (IQR: 4.58–6.98) in early failure group and 4.80 (IQR: 3.67–5.97) in late failure group, respectively (p = 0.040). (b) SpO₂/FiO₂ ratio, 125 (103–161) in early failure group and 116 (102–130) in late failure group, respectively (p = 0.134). ROX = pulse oximetry/fraction of inspired oxygen/respiratory rate; FiO₂ = fraction of inspired oxygen; and SpO₂ = percutaneous oxygen saturation.