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. 2011 Oct 13;61(4):535–542. doi: 10.1136/gutjnl-2011-300486

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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.

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Mean assessment of overall severity as a function of its rank among all mean evaluations of severity, based on 750 evaluations performed by 30 investigators on 25 out of 60 videos. Mean overall severity on a visual analogue scale ranged from 0.67 (video in the normal stratum) to 96.4 (in the most severe stratum) across 25 out of 60 videos scored by 30 investigators, indicating that the videos selected provided an appropriate range of endoscopic severity.