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. 2019 Dec 22;9(12):e031240. doi: 10.1136/bmjopen-2019-031240

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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The flow chart of participates selection of the three subsamples analysis. There were four participates missing in education status or marriage status in scene 1. There were four participates missing in education status or marriage status in scene 2. There was one participate missing in education status or marriage status in scene 3.