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. 2012 Mar 1;2(2):e000545. doi: 10.1136/bmjopen-2011-000545

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© 2012, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-commercial License, which permits use, distribution, and reproduction in any medium, provided the original work is properly cited, the use is non commercial and is otherwise in compliance with the license. See: http://creativecommons.org/licenses/by-nc/2.0/ and http://creativecommons.org/licenses/by-nc/2.0/legalcode.

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(A) Receiver operator characteristic (ROC) curve of prediction of the onset of barotrauma from high-resolution CT score. ROC curve identified the optimal cut-off value of 235 determined by the Youden Index for prediction of barotraumas onset with 73% sensitivity and 77% specificity (area under the curve, 0.77; 95% CI 0.59 to 0.95). (B) Comparison of the incidence of barotraumas between patients with the optimal cut-off value of CT score identified from ROC curve. The incidence of barotrauma of a patient with a lower CT score was significantly lower than that of a patient with a higher CT score.