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QUALIFEX Health related quality of life and radio frequency electromagnetic field exposure: Prospective cohort study. 27.11.2007 Patrizia Frei, MSc Department of Social and Preventive Medicine, University of Bern, Switzerland. Basics (1). Radio frequency electromagnetic fields ( RF EMF ).

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27 11 2007 patrizia frei msc

QUALIFEXHealth related quality of life and radio frequency electromagnetic field exposure: Prospective cohort study

27.11.2007

Patrizia Frei, MSc

Department of Social and Preventive Medicine, University of Bern, Switzerland


Basics 1

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Basics (1)

  • Radio frequency electromagnetic fields (RF EMF)


Basics 2

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Basics (2)

  • Radio frequency electromagnetic fields (RF EMF):

    • Radio transmitters

    • Television transmitters

    • Tetrapol (radio communication for authorities)

    • Mobile phones (GSM and UMTS)

    • Mobile phone base stations (GSM and UMTS)

    • Cordless phones (DECT)

    • Wireless LAN

  • Non-specific symptoms that are frequently attributed to RF EMF:

    • headache

    • dizziness

    • tiredness

    • discomfort

    • itching skin

    • sleep disorder


27 11 2007 patrizia frei msc

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

QUALIFEX: Study Overview

Year 1

(2007)

Years 2, 3 & 4

(2008 until 2010)

  • Exposimeter

  • Study:

  • Measurements

  • with exposimeter

  • Diary

  • Questionnaire

  • on exposure

  • 200 participants

  • Main Study:

  • Questionnaire on expo-

  • sure and health

  • Follow-up after one year

  • 2000 participants

Exposure assessment method

  • Sleep Study:

  • Measurement

  • with Actimeter

  • Sleep diary

  • 120 participants


27 11 2007 patrizia frei msc

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

QUALIFEX: Study Overview

Year 1

(2007)

Years 2, 3 & 4

(2008 until 2010)

  • Exposimeter

  • Study:

  • Measurements

  • with exposimeter

  • Diary

  • Questionnaire

  • on exposure

  • 200 participants

  • Main Study:

  • Questionnaire on expo-

  • sure and health

  • Follow-up after one year

  • 2000 participants

Exposure assessment method

  • Sleep Study:

  • Measurement

  • with Actimeter

  • Sleep diary

  • 120 participants


27 11 2007 patrizia frei msc

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Exposimeter

Exposimeter study

Study area


Exposimeter study statistical methods

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Exposimeter study: Statistical methods

  • Summary statistics:

    • Median and interquartile range

  • Statistical analysis:

    • Significance test of group difference:

      Wilcoxon rank-sum (Mann-Whitney) test

    • Level of significance:

      * 0.01 < p < 0.05

      ** 0.001 < p < 0.01

      *** p < 0.001


Preliminary results 1 example of a daily exposure pattern

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

lunch break

train

train

call with cordless phone

station

tram

office

bedroom

WLAN

Preliminary results (1): example of a daily exposure pattern


Preliminary results 2 results from the first 140 study participants

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Preliminary results (2): Results from the first 140 study participants

  • Median exposure over one week:

    0.20 V/m (interquartile range: 0.15-0.27 V/m)

  • Contributions of the different sources to the total exposure


Preliminary results 3 comparison of different groups

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Preliminary results (3): Comparison of different groups

  • Living close to mobile phone base stations or a radio/TV transmitter (fixed transmitter)

  • Owning a cordless phone

  • Owning a mobile phone

  • Owning WLAN


1 living close to a fixed transmitter

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

***

**

**

*

1.Living close to a fixed transmitter

***


2 owning a cordless phone

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

***

*

2.Owning a cordless phone


3 owning a mobile phone

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

**

***

3.Owning a mobile phone


4 owning wlan

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

***

*

*

4.Owning WLAN


Conclusions and outlook

ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Conclusions and Outlook

  • In our sample of 140 persons, the main contributions to the total exposure is due to mobile phones, cordless phones and mobile phone base stations

  • In terms of total exposure, there are significant differences between persons living close to transmitters and those not, and between people owning a mobile phone and those not

  • Further multivariable analyses are needed to investigate combined effects of all predictors (multiple linear regression model)


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