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. 2020 Sep 17;11:570196. doi: 10.3389/fpsyg.2020.570196

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Copyright © 2020 Ylikoski, Markkanen, Pirvola, Lehtimäki, Ylikoski, Jing, Sinkkonen and Mäkitie.

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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(A) The most common cause of tinnitus was acoustic overstimulation (noise-induced tinnitus, NIT; 47%), followed by self-reported stress (6%), otitis media (4%) and other causes (2%). The cause was unknown in 40%. (B) The most common tinnitus frequency was between 7 and 9 kHz (27%), (marked as 8), followed by 11–14 kHz (19%), (marked as 12), 9–11 kHz (14%), (marked as 10), 5–7 kHz (13%), (marked as 6). In 9 patients (5%) tinnitus frequency was >14.0 kHz, in 17 patients (10 %) between 3 and 5 kHz (marked as 4), in 11 patients (7 %) between 1 and 3 kHz (marked as 2) and in seven patients (4%) < 1.0 kHz.