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. 2020 Jul 7;22(7):e18095. doi: 10.2196/18095

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©Yao Jie Xie, Daphne SK Cheung, Alice Y Loke, Bernice L Nogueira, Karry M Liu, Angela YM Leung, Alice SM Tsang, Cindy SU Leong, Alex Molassiotis. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 07.07.2020.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Curve estimation of the duration of mobile phone usage with PSQI global score for the age group of 15-24 years. PSQI: Pittsburgh Sleep Quality Index.