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. 2019 Dec 11;65(1):122–130. doi: 10.1007/s00267-019-01228-w

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Willingness-to-pay index with respect to additional fees for requesting emptying services through telephonic contact rather than visiting office (n = 400). Statistical difference of each pair was tested via pairwise Wilcoxon rank sum tests and the results are summarized in Tables A.5 in the Supplementary Document. Boxplots indicate the median and IQRs with whiskers extend up to 1.5 × IQR (IQR from the median)