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PT Philippe Thuillier
DB David Bourhis
PR Philippe Robin
NK Nathalie Keromnes
US Ulrike Schick
PR Pierre-Yves Le Roux
VK Véronique Kerlan
PC Philippe Chaumet-Riffaud
PS Pierre-Yves Salaün
RA Ronan Abgral
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Statistical significance was assessed using a χ2 test for categorical variables and a Student’s t-test or Mann–Whitney test for quantitative variables.

High discordance rate, corresponding to the percentage of significant disagreement, such as negative vs. positive reading or uptake ≥2 grades evaluation between CI and PI interpretation, were calculated.

Concordance analysis between CI and PI interpretation and inter-observer/intra-observer variabilities were assessed by calculating kappa (κ) coefficient (25). According to Landis and Koch scale (26), a κ coefficient of less than 0.2 indicated poor agreement, 0.21–0.4 fair agreement, 0.41–0.6 moderate agreement (MA), 0.61–0.8 good agreement (GA), and 0.81–1 excellent agreement (EA).

All reported p values are two-sided. Significance level was set 0.05. Data were analyzed using SPSS statistical software v20 (IBM).

Copyright and License information:  ©2017 Thuillier, Bourhis, Robin, Keromnes, Schick, Le Roux, Kerlan, Chaumet-Riffaud, Salaün and Abgral.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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