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. 2017 Mar 9;16:22. doi: 10.1186/s12940-017-0234-4

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© The Author(s). 2017

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. 2 — Associations between relative mtDNA copy number and personal respirable dust. Scatterplots with linear and loess fit lines showing the associations between respirable dust and relative mtDNA copy number. Associations are (a) among all welders, (b) among welders with exposure level lower than 0.7 mg/m³ (median concentration = 0.5 mg/m³) and (c) among welders with exposure level higher than 0.7 mg/m³ (median concentration = 2.0 mg/m³). The cut-off of exposure level was based on median value of respirable dust from 101 welders (including measured and estimated exposures)