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. 2020 May 25;14:487. doi: 10.3389/fnins.2020.00487

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Copyright © 2020 Niemann, Boecking, Brueggemann, Mazurek and Spiliopoulou.

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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Variable importance for models on tinnitus-related distress and depression. The position of a point represents the model reliance (MR) score of a variable with respect to the best model trained on the female patient subset (F_model; x-axis) and the best model trained on the male patient subset (M_model; y-axis) (cf. Figure 2). Variables among the top-10 highest-ranked variables according to MR in the F_model, M_model, or in both models are highlighted by color. (A) target variable: tinnitus-related distress; (B) target variable: depression severity. ADSL: General Depression Scale–long form (Radloff, 1977; Hautzinger and Bailer, 2002); PSQ: Perceived Stress Questionnaire (Fliege et al., 2005); TLQ: Tinnitus Localization and Quality Questionnaire (Goebel and Hiller, 1992); TQ: German version of the Tinnitus Questionnaire (Goebel and Hiller, 1998).