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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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Bar plots showing the amount of subjects among overall population, divided in paired subgroups depending on pDBN duration, exhibiting different instrumental, and clinical features. (A) Normal or hypoactive SC VOR-gain for the affected canal at presentation. (B) Reversal of pDBN in upright position. (C) Different onset times. (D) Different outcomes. (E) Different number of CRP needed for resolution or conversion. (F) Different time needed for resolution or conversion of pDBN. Relative percentages among subgroups are reported in each column. Statistically significant differences at the Fisher's exact test are reported. CRP: canalith repositioning procedure. pDBN, positional downbeat nystagmus; SC, semicircular canal; VOR, vestibulo-ocular reflex. Statistically significant differences at the Fisher's exact test are reported and highlighted with **p < 0.01.