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. 2018 Jul 23;11(1):16. doi: 10.1186/s40413-018-0195-2

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© The Author(s). 2018

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. 4 — Distribution of doctor-diagnosed FAs by geographical regions of Vietnam in this study. a Number of doctor-diagnosed FA (n = 94) by triggering food items in four geographical regions in the web-based survey. b Number of doctor-diagnosed FA (n = 401) by triggering food items in four geographical regions in the paper-based survey. c Prevalence of FA in four geographical regions (the South Central Coast, the Central Highlands, the South East and the Mekong Delta. Asterisk ‘*’ denote significant difference in the prevalence in the South East between survey modes (P < 0.001). z-test was used to compare the two population proportions. South East is the biggest metropolitan area in Vietnam