Study type: Epidemiological study (observational study)

Case-control study on the use of cellular and cordless phones and the risk for malignant brain tumours. epidem.

Published in: Int J Radiat Biol 2002; 78 (10): 931-936

Aim of study (acc. to author)

In this study, further analyses on the database of a Swedish case-control study (see publication 9105) were performed on the use of cellular telephones and cordless telephones and the risk of brain tumors.

Further details

Furthermore, there are additional analyses of the database of the same case-control study (publication 9105) in publications 9520, 11953 and 12393.
Subjects who started their use of a mobile phone or cordless phone within one year prior diagnosis were classified as unexposed.

Endpoint/type of risk estimation

Type of risk estimation: (odds ratio (OR))

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 unexposed
Group 2 analog, 450 MHz, ever, ipsilateral
Group 3 analog, 450 MHz, ever, contralateral
Group 4 analog, 450 MHz, ever, varying ipsi/contralateral
Group 5 analog, 450 MHz, ever, all
Group 6 analog, 900 MHz, ever, ipsilateral
Group 7 analog, 900 MHz, ever, contralateral
Group 8 analog, 900 MHz, ever, varying ipsi/contralateral
Group 9 analog, 900 MHz, ever, all
Group 10 analog, 450 + 900 MHz, ever, ipsilateral
Group 11 analog, 450 + 900 MHz, ever, contralateral
Group 12 analog, 450 + 900 MHz, ever, varying ipsi/contralateral
Group 13 analog, 450 + 900 MHz, ever, all
Group 14 digital, total, ipsilateral
Group 15 digital, total, contralateral
Group 16 digital, total, varying ipsi/contralateral
Group 17 digital, total, all
Group 18 cordless, total, ipsilateral
Group 19 cordless, total, contralateral
Group 20 cordless, total, varying ipsi/contralateral
Group 21 cordless, total, all

Population

Case group

Control group

Study size

Cases Controls
Eligible 1,111 -
Participants 649 649
Participation rate 91 % 90 %
Evaluable 588 581
Statistical analysis method: (adjustment: )

Conclusion (acc. to author)

18.7 % of the cases and 18.2 % of the controls reported the use of analog cellular phones, 34.7 % of the cases and 33.0 % of the controls the use of digital cellular phones, and 30.4 % of the cases and 26.5 % of the controls the use of cordless phones.
Overall, no significantly increased risk for malignant brain tumors and the use of cellular phones and cordless phones was observed. For the ipsilateral use of analog cellular telephones, significantly increased risks for all malignant brain tumors as well for astrocytoma were found.

Study funded by

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