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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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slide1

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-29thBasics (1)
  • Radio frequency electromagnetic fields (RF EMF)
basics 2
ISEE CEEC Conference, Czech Republic, Nov 26th-29thBasics (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
slide4
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
slide5
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
slide6
ISEE CEEC Conference, Czech Republic, Nov 26th-29th

Exposimeter

Exposimeter study

Study area

exposimeter study statistical methods
ISEE CEEC Conference, Czech Republic, Nov 26th-29thExposimeter 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 2 results from the first 140 study participants
ISEE CEEC Conference, Czech Republic, Nov 26th-29thPreliminary 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-29thPreliminary 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
conclusions and outlook
ISEE CEEC Conference, Czech Republic, Nov 26th-29thConclusions 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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