Fig 2 ROC curves for the El-Ganzouri risk index, computed using Macintosh laryngoscopy or Glidescope<sup>®</sup> videolaryngoscopy as reference standard.

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Fig 2 ROC curves for the El-Ganzouri risk index, computed using Macintosh laryngoscopy or Glidescope<sup>®</sup> videolaryngoscopy as reference standard. The ciphers along the curves are the corresponding El-Ganzouri scores. SE, sensitivity; SP, specificity. Predictive value of the El-Ganzouri multivariate risk index for difficult tracheal intubation: a comparison of Glidescope® videolaryngoscopy and conventional Macintosh laryngoscopy Br J Anaesth. 2007;99(6):906-911. doi:10.1093/bja/aem297 Br J Anaesth | © The Board of Management and Trustees of the British Journal of Anaesthesia 2007. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org 1