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. 2016 Jun 22;26(5):408–416. doi: 10.1136/bmjqs-2015-004849

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This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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Estimated calibration plots for reviewers (22 UK; 13 USA) from a random slopes ordinal regression model. (A) UK study. (B) US study. A point on a curve represents the average latent score assessment given by an individual reviewer to a case note with a given percent preventability score. The shaded grey area defines a 95% prediction region over the population of reviewers for the mean latent score assigned to a given preventability percentage. The horizontal lines represent divisions on the latent scale corresponding to the Likert categories L1–L5.