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. 2018 May 19;15(5):1029. doi: 10.3390/ijerph15051029

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Boxplots of the short-term annoyance ratings as a function of (a) the L_Aeq (Subset I), (b) depth of periodic amplitude modulation (AM) and spectral shape (pink, wind turbine (WT), low frequency (LF); pooled data of situations with/without random AM), and (c) periodic AM and random AM (pooled data of situations with different spectral shapes) (Subset II). Boxes represent the interquartile range (25% and 75%) and the median (50%, horizontal line in boxes), whiskers the data within 1.5 times the interquartile range, and circles outliers outside the whiskers.