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. 2015 Feb 6;19(1):36. doi: 10.1186/s13054-015-0756-5

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© Enghard et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Correlation of the extravascular lung water index with the ultrasound score. (A) We found a close correlation of the ultrasound (US) score with the extravascular lung water index (EVLWI) (Spearman’s r = 0.91, P < 0.0001). (B) Correlation of the blinded US score as a mean of two independent examiners is shown (Spearman’s r = 0.72, P < 0.0001). (C) Bland-Altman plot comparing the difference (EVLWI − US score) with the average (of EVLWI and US score). Additionally, a linear regression (difference = 7.62 − 0.46 × average) and the 95% confident intervals (linear regression ± 1.96 × 3.6) are plotted. (D) Receiver operating characteristic curves of the US score obtained to identify patients with EVLWIs >7 and >15 show excellent diagnostic performance, as indicated by the areas under the curve of 0.9419 and 0.9636.