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. 2020 Sep 25;11:577052. doi: 10.3389/fneur.2020.577052

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Copyright © 2020 Olde Dubbelink, De Kleermaeker, Meulstee, Bartels, Claes and Verhagen.

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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Ultrasound results of the 253 patients. The red bars represent the number of patients with abnormal ultrasonography results and the blue bars normal ultrasonography results. Using a wrist-circumference dependent upper limit of normal (ULN), 190 patients (75.1%) had abnormal US results vs. 177 patients (70.0%) using a fixed ULN of the cross-sectional area of the median nerve of 11 mm² (p = 0.015). The mean CSA of these 190 and 177 patients with abnormal US results were 14.9 (±4.1) and 15.2 (±4.1), respectively, without a statistically significant difference (p = 0.201).