Korean J Fam Pract. 2018; 8(4): 570-577  https://doi.org/10.21215/kjfp.2018.8.4.570
Associations between Usage Time of Multimedia and Body Mass Index in Korean Adolescents
Yunsung Cho, Miji Kang, Hyukjung Kweon*, Eunjung Oh, Ahleum Ahn, Jisun Lee, Jaekyung Choi, Dongyung Cho
Department of Family Medicine, Konkuk University School of Medicine, Seoul, Korea
Hyukjung Kweon Tel: +82-43-840-8661, Fax: +82-43-840-8962 E-mail: fmkhj@korea.com ORCID: http://orcid.org/0000-0001-6686-1303
Received: July 6, 2017; Revised: September 27, 2017; Accepted: October 7, 2017; Published online: August 20, 2018.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Using multimedia for long durations may have adverse health effects, such as obesity and metabolic syndrome. However, studies about these effects on Korean adolescents are still rare. The purpose of this study was to investigate the correlation between the usage time of multimedia and body mass index (BMI) in Korean adolescents using the Korean Children & Youth Panel Survey (KCYPS) by cross-sectional analysis and longitudinal study.
Methods: An analysis of data on the “Middle School 1 panel” (2011–2015) of the KCYPS was conducted. A total of 2,280 subjects as of 2011 were enrolled in the “Middle School 1 panel,” and this sample group was followed up annually. Data on height (cm), body weight (kg), and the usage times of television, video, and computer games in the sample group were acquired through the survey papers. The study subjects were divided into all-gender, male-only, and female-only groups according to sex, and continuous data were compared using one-way analysis of variance. Pearson correlation analysis was performed to analyze the correlation between the usage time of audiovisual media and BMI.
Results: The mean BMI showed an increasing tendency as age increased. The usage time of multimedia decreased with increasing age, except in 2015.There were statistically significant positive correlations between the usage times of computer games (non-school days) and BMI in 2011–2015. The correlation coefficients generally increased with increasing age.
Conclusion: There was a positive correlation between computer/game use time and BMI and it showed an increasing tendency with increasing age.
Keywords: Usage Time of Audiovisual Media; Body Mass Index; Adolescent; Korean Children & Youth Panel Survey; Longitudinal Study
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