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. 2020 Aug 27;19:91. doi: 10.1186/s12940-020-00649-z

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 7 — Funnel plots of term birth weight for publication bias. The analysis was adjusted for demographic characteristics of the subjects (left panel, P = 0.0005 for Egger’s asymmetry test of the funnel plot), with further adjustment for air quality factors (middle panel, P < 0.0001 for Egger’s test) and demographic and civilization factors regardless of air quality effects (right panel, P = 0.0881 for Egger’s test)