この研究は、中国の思春期層の携帯電話（MP）使用と「不注意」の関連を調査した人口ベース横断研究である。中学生を対象に、人口統計学的特性、MP使用状況、「不注意」に関する質問票調査を実施した。「不注意」は、精神障害の診断・統計マニュアル第4版（DSM-IV）に定められた注意欠陥・多動性障害（ADHD）の注意欠陥成分のスコアにより判定した。その結果、7102人から回答を得た（回答率91.99%）；交絡因子調整後に、「不注意」は、MP所有、MPでの娯楽に費やす時間、MPの昼間の置き場所、MPの夜間のモードと有意に関連した､などの所見を報告している。
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A cross-sectional study was conducted in China to investigate the association between mobile phone use and inattention in adolescents.
Inattention was assessed by using the most stable psychometric properties of the Attention Deficit component of Attention deficit/Hyperactivity disorder (ADHD) by the Diagnostic and Statistical Manual of Mental Disorders. The choice of nine inattention descriptions was 'yes' or 'no'. Inattention was defined when the teacher chose six or more 'yes' responses to the descriptions.
| グループ | 説明 |
|---|---|
| 参照集団 1 | mobile phone ownership: no |
| 集団 2 | mobile phone ownership: yes |
| 参照集団 3 | mobile phone use: 0 - 2 years |
| 集団 4 | mobile phone use: 3 - 4 years |
| 集団 5 | mobile phone use: > 4 years |
| 参照集団 6 | mobile phone use for 0 - 2 years, time spent on calls: 0 - 1 min/day |
| 集団 7 | mobile phone use for 0 - 2 years, time spent on calls: 1 - 6 min/day |
| 集団 8 | mobile phone use for 0 - 2 years, time spent on calls: > 6 min/day |
| 参照集団 9 | mobile phone use for 3 - 4 years, time spent on calls: 0 - 1 min/day |
| 集団 10 | mobile phone use for 3 - 4 years, time spent on calls: 1 - 6 min/day |
| 集団 11 | mobile phone use for 3 - 4 years, time spent on calls: > 6 min/day |
| 参照集団 12 | mobile phone use for > 4 years, time spent on calls: 0 - 1 min/day |
| 集団 13 | mobile phone use for > 4 years, time spent on calls: 1 - 6 min/day |
| 集団 14 | mobile phone use for > 4 years, time spent on calls: > 6 min/day |
| 参照集団 15 | mobile phone use for 0 - 2 years, time spent on entertainment: 0 - 20 min/day |
| 集団 16 | mobile phone use for 0 - 2 years, time spent on entertainment: 21 - 60 min/day |
| 集団 17 | mobile phone use for 0 - 2 years, time spent on entertainment: > 60 min/day |
| 参照集団 18 | mobile phone use for 3 - 4 years, time spent on entertainment: 0 - 20 min/day |
| 集団 19 | mobile phone use for 3 - 4 years, time spent on entertainment: 21 - 60 min/day |
| 集団 20 | mobile phone use for 3 - 4 years, time spent on entertainment: > 60 min/day |
| 参照集団 21 | mobile phone use for > 4 years, time spent on entertainment: 0 - 20 min/day |
| 集団 22 | mobile phone use for > 4 years, time spent on entertainment: 21 - 60 min/day |
| 集団 23 | mobile phone use for > 4 years, time spent on entertainment: > 60 min/day |
| 参照集団 24 | habit of answering the phone: close to ear |
| 集団 25 | habit of answering the phone: hands-free |
| 集団 26 | habit of answering the phone: headphone use |
| 参照集団 27 | position of mobile phone during the day: do not carry |
| 集団 28 | position of mobile phone during the day: hang in front of chest |
| 集団 29 | position of mobile phone during the day: in coat pockets |
| 集団 30 | position of mobile phone during the day: in trouser pockets |
| 集団 31 | position of mobile phone during the day: in bags |
| 参照集団 32 | mode of mobile phone at night: power on and beside the head |
| 集団 33 | mode of mobile phone at night: power on and keep away from the head |
| 集団 34 | mode of mobile phone at night: power off |
| タイプ | 値 |
|---|---|
| 合計 | 7,720 |
| 参加者 | 7,426 |
| 参加率 | 96 % |
| 評価可能 | 7,102 |
Overall, 5668 (79.8%) participants owned mobile phones at the time of the survey and had been using a mobile phone for a mean of 3.50 ± 2.48 years. Participants spent 57.36± 71.96 minutes on entertainment and 8.64 ± 15.48 minutes on making calls daily.
The overall prevalence of inattention was 69.8% out of the 7102 valid questionnaires.
Inattention was significantly associated with mobile ownership (OR 2.92, CI 2.51-3.39) and time spent on entertainment daily (more than 60 min: OR 1.87, CI 1.28-2.73). Compared to students, who did not carry their mobile phones, a significant reduced risk for inattention was observed among students who hung their mobile phones in front of the chest (OR 0.44, CI 0.19-0.99) and a significant increased risk was found for students who put their mobile phones in trouser pockets (OR 1.34, CI 1.10-1.62). Furthermore, participants who powered off their mobile phones at night showed significantly less inattention than those students who left their mobile phones on at night (OR 0.75, CI 0.63-0.90).
The authors conclude that mobile phone ownership, the time spent on entertainment on the mobile phone, the position of the during the day and the mode of the MP at night were all significantly associated with inattention in Chinese adolescents. Decreasing mobile phone use for entertainment to less than 60 minutes per day and turning off during sleep may help adolescents to stay focused and centered.
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