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Psychiatry Clin Neurosci. 2018 Sep;72(9):723-730. doi: 10.1111/pcn.12686. Epub 2018 Jul 2.

Prevalence rate of Internet addiction among Japanese college students: Two cross-sectional studies and reconsideration of cut-off points of Young's Internet Addiction Test in Japan.

Author information

1
Tokiwa Child Development Center, Tokiwa Hospital, Sapporo, Japan.
2
Department of Neuropsychiatry, Sapporo Medical University, School of Medicine, Sapporo, Japan.
3
Mental Health and Neurosciences Division, VA Portland Health Care System, Portland, USA.
4
Department of Psychiatry, School of Medicine, Oregon Health & Science University, Portland, USA.
5
Miki Mental Clinic, Hokujinkai Medical Corporation, Sapporo, Japan.
6
Department of Neuropsychiatry, Graduate School of Medical Sciences Kyushu University, Fukuoka, Japan.

Abstract

AIM:

Due to variation in estimates of the prevalence of Internet addiction (IA) in prior research, we conducted two cross-sectional studies over 2 years investigating the prevalence rate of IA in college students in Japan and reconsidered appropriate cut-off points of a self-rating scale to screen possible IA.

METHODS:

This study was composed of two parts: survey I in 2014 and survey II in 2016, which were conducted in the same schools with an interval of 2 years. The study questionnaire included questions about demographics and Internet use, and Young's Internet Addiction Test (IAT). Additionally, the subjects in survey II were asked about self-reported IA.

RESULTS:

There were 1005 respondents in total with a mean age (± SD) of 18.9 ± 1.3 years. The mean IAT scores remained stable between 2014 and 2016: 45.2 ± 12.6 in survey I and 45.5 ± 13.1 in survey II (overall mean IAT score of 45.4 ± 13.0). With respect to self-reported IA in survey II, a total of 21.6% admitted to having IA (score of 5 or 6 on a 6-point Likert scale). We categorized these subjects as IA, and the remainder as non-IA. The mean IAT score showed a significant difference between these two groups (57.8 ± 14.3 vs 42.1 ± 10.7, P < 0.001).

CONCLUSION:

The severity of IA symptoms among Japanese college students has appeared stable in recent years, with mean IAT scores of over 40. Our results suggest that a screening score cut-off of 40 on the IAT could be reconsidered and that 50 might be proposed for the cut-off.

KEYWORDS:

Internet addiction; Internet gaming disorder; Internet use disorder; behavioral addiction; pathological Internet use

PMID:
29845676
DOI:
10.1111/pcn.12686
[Indexed for MEDLINE]

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