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. 2019 Mar 31;8:27. doi: 10.1186/s40249-019-0535-7

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© The Author(s). 2019

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Dose-response curves of Oncomelania hupensis, Biomphalaria alexandrina, and Bulinus truncatus snails subjected to aqueous dilutions of 4% TDS for 24 h. a Oncomelania hupensis; b Biomphalaria alexandrina; c Bulinus truncatus; d The equality and parallelism of the regression lines of different snail species after 24 h exposure, tested by LR. O. h., Oncomelania hupensis; B. a., Biomphalaria alexandrina; B. t., Bulinus truncatus. The equality of the regression lines were tested using the likelihood ratio (LR). In general, there are significant differences between slopes and intercepts of lines (χ² = 206, P < 0.05). The parallelism of slopes is tested by the LR. In general, there are significant differences between the regression lines (χ² = 39.6, P < 0.05)