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. 2018 May 22;19:287. doi: 10.1186/s13063-018-2663-y

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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. 2 — Youths’ and caregivers’ quartile of exposure level by intervention group. Total exposure score was stratified by quartiles (very low, low, medium, and high). Caregivers’ exposure levels of very low ranged from 0 to 0.25 with mean score of 0.08, low ranged from 0.27 to 0.75 with mean score of 0.48, medium ranged from 0.75 to 1.65 with mean score of 1.14, and high ranged from 1.67 to 6.76 with mean score of 2.79. Youths’ exposure levels of very low ranged from 0 to 0.18 with mean score of 0.04, low ranged from 0.20 to 0.62 with mean score of 0.36, medium ranged from 0.63 to 1.58 with mean score of 1.0, and high ranged from 1.60 to 7.57 with mean score of 3.0