Study type: Epidemiological study (observational study)

Cellular and cordless telephones and the risk for brain tumours. epidem.

Published in: Eur J Cancer Prev 2002; 11 (4): 377-386

Aim of study (acc. to author)

A population-based case-control study was conducted in Sweden to investigate the risk of brain tumors and the use of cellular telephones and cordless telephones.

Further details

Further analyses of the database of this case-control study are published in the publications 9520, 9361, 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, > 1 year latency
Group 3 analog, 450 MHz, > 5 years latency
Group 4 analog, 450 MHz, > 10 years latency
Group 5 analog, 900 MHz, > 1 year latency
Group 6 analog, 900 MHz, > 5 years latency
Group 7 analog, 900 MHz, > 10 years latency
Group 8 analog, all, > 1 year latency
Group 9 analog, all, > 5 years latency
Group 10 analog, all, >10 years latency
Group 11 analog, ≤ 85 h, > 1 year latency
Group 12 analog, ≤ 85 h, > 5 years latency
Group 13 analog, ≤ 85 h, >10 years latency
Group 14 analog, > 85 h, > 1 year latency
Group 15 analog, > 85 h, > 5 years latency
Group 16 analog, > 85 h, > 10 years latency
Group 17 digital, all, > 1 year latency
Group 18 digital, all, > 5 years latency
Group 19 digital, all, >10 years latency
Group 20 digital, ≤ 55 h, > 1 year latency
Group 21 digital, ≤ 55 h, > 5 years latency
Group 22 digital, ≤ 55 h, >10 years latency
Group 23 digital, > 55 h, > 1 year latency
Group 24 digital, > 55 h, > 5 years latency
Group 25 digital, > 55 h, >10 years latency
Group 26 cordless, all, > 1 year latency
Group 27 cordless, all, > 5 years latency
Group 28 cordless, all, > 10 years latency
Group 29 cordless, ≤ 183 h, > 1 year latency
Group 30 cordless, ≤ 183 h, > 5 years latency
Group 31 cordless, ≤ 183 h, > 10 years latency
Group 32 cordless, > 183 h, > 1 year latency
Group 33 cordless, > 183 h, > 5 years latency
Group 34 cordless, > 183 h, > 10 years latency

Population

Case group

Control group

Study size

Cases Controls
Eligible 1,617 -
Contacted 1,617 1,617
Participants 1,429 1,470
Participation rate 88 % 91 %
Evaluable 1,303 1,470
Other:

1303 complete pairs were used for statistical analysis.

Statistical analysis method:

Conclusion (acc. to author)

17.3 % of the cases and 14.8 % of the controls reported the use of analog cellular phones, 29.6 % of the cases and 29.5 % of the controls the use of digital cellular phones, and 28.1 % of the cases and 26.9 % of the controls the use of cordless phones. An increased risk for brain tumor and the use of analog cellular phones was found. For digital cellular phones and cordless phones no significantly increased risk was observed overall within a 5-year latency period.

Limitations (acc. to author)

The median time of use was 3 years for digital cellular phones, 5 years for cordless phones and 7 years for analog cellular phones.

Study funded by

Comments on this article

Related articles