Study type: Epidemiological study (observational study)

Case-control study of the association between the use of cellular and cordless telephones and malignant brain tumors diagnosed during 2000-2003. epidem.

Published in: Environ Res 2006; 100 (2): 232-241

Aim of study (acc. to author)

A case-control study on the use of cellular and cordless telephones and the risk for brain tumors was conducted in Sweden.

Further details

This study reports results for malignant brain tumors whereas the results for benign brain tumors, mainly meningioma and acoustic neuroma, are presented in publication 12068.
Subjects who started their use of a mobile 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, 1-5-year-latency
Group 3 analog, > 5-10-year latency
Group 4 analog, > 10-year latency
Group 5 analog, total, > 1-year latency
Group 6 analog, ≤ 80 h, 1-5-year-latency
Group 7 analog, ≤ 80 h, 5-10-year-latency
Group 8 analog, ≤ 80 h, > 10-year latency
Group 9 analog, ≤ 80 h, total, > 1-year latency
Group 10 analog, > 80 h, 1-5-year-latency
Group 11 analog, > 80 h, 5-10-year-latency
Group 12 analog, > 80 h, > 10-year latency
Group 13 analog, > 80 h, total, > 1-year latency
Group 14 digital, 1-5-year-latency
Group 15 digital, > 5-10-year latency
Group 16 digital, > 10-year latency
Group 17 digital, total, > 1-year latency
Group 18 digital, ≤ 64 h, 1-5-year-latency
Group 19 digital, ≤ 64 h, > 5-10-year latency
Group 20 digital, ≤ 64 h, > 10-year latency
Group 21 digital, ≤ 64 h, total, > 1-year latency
Group 22 digital, > 64 h, 1-5-year-latency
Group 23 digital, > 64 h, > 5-10-year latency
Group 24 digital, > 64 h, > 10-year latency
Group 25 digital, > 64 h, total, > 1-year latency
Group 26 cordless, 1-5-year-latency
Group 27 cordless, > 5-10-year latency
Group 28 cordless, > 10-year latency
Group 29 cordless, total, > 1-year latency
Group 30 cordless, ≤ 243 h, 1-5-year-latency
Group 31 cordless, ≤ 243 h, > 5-10-year latency
Group 32 cordless, ≤ 243 h, > 10-year latency
Group 33 cordless, ≤ 243 h, total, > 1-year latency
Group 34 cordless, > 243 h, 1-5-year-latency
Group 35 cordless, > 243 h, > 5-10-year latency
Group 36 cordless, > 243 h, > 10-year latency
Group 37 cordless, > 243 h, total, > 1-year latency

Population

Case group

Control group

Study size

Cases Controls
Eligible 359 820
Participants 317 692
Participation rate 88 % 84 %
Statistical analysis method: (adjustment: )

Conclusion (acc. to author)

The results showed an increased risk for malignant brain tumors in association with the use of analog and digital cellular phones and cordless phones. The risk increased with the latency period and the number of hours use for phone calls.

Study funded by

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