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Epidemiological Study (survey)The Association between Use of Mobile Phones after Lights Out and Sleep Disturbances among Japanese Adolescents: A Nationwide Cross-Sectional Survey. epidemiol. By: Munezawa T, Kaneita Y, Osaki Y, Kanda H, Minowa M, Suzuki K, Higuchi S, Mori J, Yamamoto R, Ohida T
Published in: Sleep 2011; 34 (8): 1013 - 1020 (  full article, PubMed Entry , Journal web site )Aim of study (according to author)
A cross-sectional survey was conducted in Japan to investigate the association between the use of mobile phones after lights out and sleep disturbances among adolescents.
Endpoint/type of risk estimation - sleep disturbances: sleep duration, sleep quality, excessive daytime sleepiness, insomnia
Estimate of prevalence by odds ratio (OR)
Exposure - mobile phone
- type of exposure: personal
- assessment by questionnaire (mobile phone use during previous month, mobile phone use for calling and for texting after lights out)
groups of exposure:
| Reference group 1: | number of times mobile phone used for calling after lights out: 0 | | group 2: | number of times mobile phone used for calling after lights out: 1-3/month | | group 3: | number of times mobile phone used for calling after lights out: 1/week | | group 4: | number of times mobile phone used for calling after lights out: several/week | | group 5: | number of times mobile phone used for calling after lights out: daily | | Reference group 6: | number of times mobile phone used for sending text messages after lights out: 0 | | group 7: | number of times mobile phone used for sending text messages after lights out: 1-3/month | | group 8: | number of times mobile phone used for sending text messages after lights out: 1/week | | group 9: | number of times mobile phone used for sending text messages after lights out: several/week | | group 10: | number of times mobile phone used for sending text messages after lights out: daily |
Population
Study group: children, aged from 13 to 19 years
Group characteristics: adolescents
Observation period: December 2008 - January 2009
Study location: Japan
Source of data: junior and senior high schools in Japan
Further parameters acquired by questionnaire (sex, school grade, type of school; lifestyle (breakfast , extracurricular activities, smoking, alcohol comsumption); sleep assessment; mental health status (depression/anxiety, decrease in positive feeling))
Study size  | |
|---|
| number participating | 95,680 | | rate of participating | 63% | number of complete follow-up/
available for analysis | 94,777 |
Statistical analysis using logistic regression (adjusted for sex, school grade, drinking alcohol, eating breakfast, extracurricular activities, and mental health) Results/conclusion (according to author)
Daily mobile phone use, even if for only a brief moment every day, was reported by 84.4 % of the adolescents. 8.3 % of the high school students reported using their mobile phones every day for calling after lights out and 17.6 % reported using their mobile phone for sending text messages after lights out.
Data analysis showed that mobile phone use for calling and for sending text messages after lights out was associated with sleep disturbances (short sleep duration, subjective poor sleep quality, excessive daytime sleepiness, and insomnia symptoms).
The authors conclude that the use of mobile phones for calling and for sending text messages after lights out is associated with sleep disturbances among Japanese adolescents.
Limitations (according to author): The results of the study should be interpreted with caution due to the small effect sizes (odds ratios).
(Study character: epidemiological study, survey)
Study funded by - Ministry of Health, Labour and Welfare, Japan
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Glossary: adolescents, alcohol, anxiety, children, depression, epidemiological, exposure, follow-up, health, logistic regression, mental, mobile phone, Odds Ratios, prevalence, questionnaire, sleep, sleep disturbances, statistical, survey, symptoms |
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