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      Relationship between problematic Internet use and age at initial weekly Internet use

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          Background and aims

          An important proportion of infants and adolescents in Japan are using Internet-equipped devices, including smartphones, tablets, and game consoles. However, the relationship between the risk of IA and the age at initial habitual Internet use remains unknown. We aimed to investigate this relationship among adolescents.


          We surveyed 1,775 subjects in seven public junior high schools in Kanagawa prefecture, Japan, in November 2017. Students were asked to complete the Young's Diagnostic Questionnaire (YDQ), which captured information regarding gender, school grade, night sleep, age at which they first started using the Internet at least once weekly, Internet usage situation, and Internet use time for purposes other than study. Data from subjects who reported experience of weekly Internet use were analyzed.


          Junior high school students who were younger at initial weekly Internet use tended to have problematic Internet use (PIU) and to spend more time on Internet activities. In particular, initial weekly Internet use before the age of five in boys was associated with a significantly increased risk of PIU (YDQ ≥ 5), with an odds ratio of 14.955, compared with initial weekly Internet use after the age of 12. Smartphone ownership significantly increased the risk of PIU compared with no ownership among the total population and among girls.

          Discussion and Conclusions

          Junior high school male students displayed a robust relationship between initial weekly Internet use and PIU, whereas junior high school female students displayed a particularly strong relationship between smartphone ownership and PIU. Therefore, longitudinal IA preventive education from an early age is necessary.

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          Author and article information

          Journal of Behavioral Addictions
          J Behav Addict
          Akadémiai Kiadó (Budapest )
          07 April 2020
          : 1-11
          [1 ] National Hospital Organization Kurihama Medical and Addiction Center , Yokosuka, Kanagawa, Japan
          [2 ] departmentDepartment of Neuropsychiatry , Keio University School of Medicine , Shinjuku, Tokyo, Japan
          Author notes
          [* ]Corresponding author. National Hospital Organization Kurihama Medical and Addiction Center , 5-3-1 Nobi, Yokosuka, Kanagawa, Japan. Tel.: +81 046 848 1550; fax: +81 046 849 7743. E-mail: matimi19750519@
          © 2020 The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution‐NonCommercial 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium for non-commercial purposes, provided the original author and source are credited, a link to the CC License is provided, and changes – if any – are indicated.

          Page count
          Figures: 02, Tables: 05, Equations: 00, References: 47, Pages: 11
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