研究のタイプ: 疫学研究 (observational study)

[症状と無線通信装置の使用:スイスの青年期における前向きコホート研究] epidem.

Symptoms and the use of wireless communication devices: a prospective cohort study in Swiss adolescents.

掲載誌: Environ Res 2017; 154: 275-283

この研究は、中央スイス地方の青少年(n=439:参加率36.8%、12-17歳)が参加した前向きコホート研究で、無線通信機器(携帯電話および他の機器)の使用自体あるいはそれら機器からの無線周波電磁界RF-EMFばく露量指標(計算)が自己申告された健康症状と関するか否かを調べた。参加者は、ベースライン時(2012/2013年)およびその1年後(2013/2014年)に、質問票(携帯電話およびコードレス電話の使用状況、症状の自己申告、可能性のある交絡因子)に回答した。サブグループ(n=234)に関しては、オペレータの携帯電話データを入手した。ばく露量指標は、RF-EMFばく露への影響要因を考慮に入れて、脳および全身について計算したばく露量に基づいた。コホート分析では、1年間の累積ばく露が、ベースライン時からフォローアップ時までの期間中の新たな症状発症に関連するかを分析した。その結果、フォローアップ調査の参加率は97%(n=425)であった;横断的分析、コホート分析のどちらにおいても、RF-EMFばく露とは微々たる関連しかもたない使用指標(例えば、テキストメッセージの送信回数/日)がさまざまな症状とほぼ関連する傾向を示した;携帯電話通話時間あるいはばく露量指標と各種症状との関連は全般的に見て、「強くない」あるいは「ない」であった、と報告している。

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研究の目的(著者による)

A prospective cohort study was conducted in Switzerland to investigate whether self-reported symptoms of adolescents are associated with radiofrequency electromagnetic fields from mobile phones and other wireless devices or by the wireless device use itself due to non-radiation related factors in that context.

詳細情報

Headache was assessed using the Headache Impact Test (HIT-6). Tiredness, lack of energy, lack of concentration and exhaustibility were assessed using a four-point Likert scale. Physical well-being was assessed using five questions of the Kidscreen-52 questionnaire.
Two main analyses were performed: 1) a cross-sectional analysis of a combined dataset consisting of baseline and follow-up data and b) a cohort analysis, including all participants without the target symptom at baseline, to investigate whether occurrence of the symptom was related to cumulative wireless device use or cumulative RF-EMF dose.
Further results of the HERMES (Health Effects Related to Mobile phonE use in adolescentS) study are published on behavioral problems and concentration capacity by Roser et al. (2016), on memory performance by Schoeni et al. (2015), on subjective symptoms in relation to fixed site transmitters by Schoeni et al. (2016) and on subjective symptoms associated with mobile phone use Schoeni et al. (2016).

影響評価項目/リスク推定のタイプ

リスク推定のタイプ:

ばく露

ばく露評価

調査対象集団

調査規模

タイプ
合計 439
参加率 37 %
統計学的分析方法: ( 調整: )

結論(著者による)

In the cross-sectional and cohort analyses, various symptoms tended to be mostly associated with usage measures that are only marginally related to exposure to radiofrequency electromagnetic fields such as the number of text messages sent per day (e.g. tiredness: OR 1.81, CI 1.20-2.74 for cross-sectional analyses and OR 1.87, CI 1.04-3.38 for cohort analyses). Outcomes were generally less strongly or not associated with mobile phone call duration and RF-EMF dose measures.
The authors concluded that stronger associations between symptoms of ill health in Swiss adolescents and wireless communication device use than for radiofrequency electromagnetic fields dose measures were observed. Such a result pattern does not support a causal association between exposure to radiofrequency electromagnetic fields and health symptoms of adolescents but rather suggests that other aspects of extensive media use are related to symptoms.

研究助成

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