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Yoon Shin Kim and Sung Ho Choi

Health Subjective Symptoms using mobile phones among School Children. Yoon Shin Kim and Sung Ho Choi. Institute of Environmental and Industrial Medicine, College of Medicine, Hanyang University.

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Yoon Shin Kim and Sung Ho Choi

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  1. Health Subjective Symptoms • using mobile phones among School Children Yoon Shin Kim and Sung Ho Choi Institute of Environmental and Industrial Medicine, College of Medicine, Hanyang University Presented at International workshop on Health Effects of EMF and Bioelectromagnetic Environment Educational Culture Hall September 6, 2007

  2. Contents • Backgrounds • Objectives • Materials and Methods • Results • Summary & Discussion

  3. Backgrounds • Mobile phone(MP) use is rapidly increasing worldwide. With the increase in mobile phone use, potential concerns related to mobile phones continue to surface. • The currently available scientific evidence is not sufficient draw firm conclusions on potential health effects related to mobile phones (IEGMP, 2000;Ahlbom et al.,2004).

  4. Special attention is given to potential adverse health effects among children due to potentially increased vulnerability of children to radiofrequency exposures and the expected much longer duration of exposure during their lifetime (Kheifets et al., 2005).

  5. Use of mobile phone in children

  6. Symptoms related mobile phone • Electrosensitivity covers symptoms attributed by a person who suffers from being in the vicinity or using electric equipment. It results in varied degrees of discomfort or poor health perceived (BBEMG, 2007).

  7. In a previous cross-sectional study among 7800 mobile phone (MP) users in Sweden, about 13% of the respondents reported at least one symptom in connection with their MP use. The most commonly reported symptoms were warmth sensations on and around the ear, burning sensations in the skin, and headaches (Oftedal et al.,2000; Sandstrom et al., 2001).

  8. Observational study about symptoms related mobile phone (Seitz, 2005)

  9. Suspected reasons for subjective symptoms in switzerland

  10. Why do we have to study children? (M.Roosli, 2006) • Increased sensitivity of children? • deeper penetration relative to head size(more vulnerable areas?) • developing nervous system (more vulnerable?) • more conductive brain tissue (larger SAR?) • The lack of data causes conflicting recommendations from decision-makers • WHO/EMF-Net : A brain tumor study in children has a high priority in their research recommendation • Use of mobile phone is very prevalent among children and adolescents

  11. Objectives The objective of this study is to assess the use of mobile phone and investigate the relationship between mobile phone use and health related symptoms.

  12. Materials and Methods • Questionnaire study • Subject : 700 school children (4 schools, Incheon, Suncheon, sixth grade, age 11~12 years) • Health Questionnaire item : Headache, Dizzness, Problems in concentration, Nervousness, Physical fatigue, Memory loss, Ear burning sensation, Face burning sensation, Dry skin, Face irritation, Eye problems (Jonna Wilen, 2003) • Statistical analysis : Proc Freq/chisq analysis (SAS version 9)

  13. EEG/ECG test • Voulnteer : Mobile phone user (8 boys /16 girls) Non user (8 boys /16 girls) →1:1matching • EEG index: Absolute power, relative power & SEF 90 • ECG index : Low/high frequency, SDNN(Standard deviation of R-R interval), LF/HF ratio, m-RRI(Mean R-R interval), MEF(Median edge frequency) • Statistical analysis : Proc ttest analysis(SAS version 9)

  14. Sleep quality study • Subjective record during one month (Good, Normal, Bad) • Statistical analysis : Proc ttest analysis(SAS version 9)

  15. (1) Questionnaire study- General characteristics -

  16. General characteristics by mobile phone owner and User

  17. Health related index by Mobile phone user

  18. Subjective symptoms by frequency of mobile phone use

  19. (2) EEG & ECG Test- General characteristics -

  20. EEG results by mobile phone users and nonusers

  21. ECG results by mobile phone users and nonusers

  22. (3) Sleep quality Test Health related symptoms and sleep quality by mobile phone users and nonusers

  23. Summary & Discussion • Questionnaire study • MP user • MP nonuser • EEG & ECG test • MP user • MP nonuser There is no significant differences on subjective symptoms such as dizzness,headache, memory loss, and so on There is no significant differences on EEG index such as absolute power, relative power, SEF90 and ECG index such as LF, HF, SDNN, M-RRI, LF/HF

  24. Sleep quality study • MP user • MP nonuser • The reason about no significant difference between MP users and nonusers is that EEG & ECG may affect acutely on radiofrequency electromagnetic field. • So, we will continue to study on studying ability and cognitive test. There is no significant differences on subjective record during one month

  25. This preliminary study is first reported on the percent of mobile phone ownership, pattern of use and health related symptoms among elementary school children in Korea. • The further study is needed to understand study ability of school children between MP user and non-user. • If research ethical approval can be obtained, acute effects on cognition and EEGs should be investigated in children exposed to RF fields in the future.

  26. Thank you !!

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