Study type: Epidemiological study (observational study)

Time trends in brain tumor incidence rates in Denmark, Finland, Norway, and Sweden, 1974-2003. epidem.

Published in: J Natl Cancer Inst 2009; 101 (24): 1721-1724

Aim of study (acc. to author)

The time trends in brain tumor incidence rates in Denmark, Finland, Norway, and Sweden from 1974 to 2003 were investigated to evaluate possible associations with respect to radio frequency exposure to mobile phones after 5 to 10 years of exposure.

Further details

Mobile phone use in the Nordic countries started in the mid-1980s and increased sharply in the mid-1990s.

Endpoint/type of risk estimation

Type of risk estimation: (standardized incidence rate (SIR))

Exposure

Population

Study size

Type Value
Total 59,984
Other:

population: 16 million adults aged 20 - 79 years

Statistical analysis method:

Conclusion (acc. to author)

From 1974 to 2003, the brain tumor incidence rates in Denmark, Finland, Norway, and Sweden were stable, decreased, or continued a gradual increase that started before the introduction of mobile phones. No change in incidence trends was found in the time period of 1998 to 2003, the time when possible associations between mobile phone use and brain tumor risk would be informative about an induction period of 5 to 10 years.
The authors concluded that the lack of a detectable trend change in incidence up to 2003 suggests that the induction period for brain tumors associated with mobile phone use exceeds 5 to 10 years, the increased risk for brain tumors in association with mobile phones use in this population is too small to be observed, the increased risk is restricted to subgroups of brain tumors or mobile phone users, or there is no increased risk for brain tumors associated with mobile phone use.

Study funded by

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