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. 2020 Oct 15;11:578588. doi: 10.3389/fneur.2020.578588

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Copyright © 2020 Castellucci, Malara, Martellucci, Botti, Delmonte, Quaglieri, Rebecchi, Armato, Ralli, Manfrin, Ghidini and Asprella Libonati.

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) and the copyright owner(s) 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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Box plots correlating medians of AR values for air-conducted ocular VEMPs values among 26 patients submitted to electrophysiological testing, divided according to different features. (A) Affected semicircular canal. (B) Affected side. (C) Gender. (D) History of recent BPPV. (E) History of recent head trauma. (F) Onset time. (G) Outcome. (H) Number of CRP needed to restore or convert pDBN. (I) Time needed for resolution or conversion of pDBN. No statistically significant differences at the Mann-Whitney U-test are reported. Horizontal dashed lines represent the border between normal and pathologic AR values for ocular VEMPs (35%) and values within gray areas represent abnormal measurements. AR, asymmetry ratio; ASC, anterior semicircular canal; BPPV, benign paroxysmal positional vertigo; CRP, canal repositioning procedures; F, female; M, male; oVEMPs, ocular vestibular-evoked myogenic potentials; pDBN, positional downbeat nystagmus; PSC non-amp, posterior semicircular canal non-ampullary arm. Values at a greater distance from the median than 1.5 times and 3 times the IQR are plotted individually as dots (weak outliers) and asterisks (strong outliers), respectively.