Friday, October 21, 2011

Using Mobile phone,no brain problem


USING mobile phones does not cause brain cancer according the largest study ever conducted on the subject, but Australian experts are still wary about the results.
According to the 18-year long study of more than 350,000 people, there is little to no increase in the risk of brain tumours in mobile phone users compared with people who do not use them.

Researchers from the Danish Institute of Cancer Epidemiology in Copenhagen studied the data of 10,729 tumours of the central nervous system and found long-term mobile users had similar cancer rates to those who had not had a mobile phone contract.


Objective To investigate the risk of tumours in the central nervous system among Danish mobile phone subscribers.
Design Nationwide cohort study.
Setting Denmark.
Participants All Danes aged ≥30 and born in Denmark after 1925, subdivided into subscribers and non-subscribers of mobile phones before 1995.
Main outcome measures Risk of tumours of the central nervous system, identified from the complete Danish Cancer Register. Sex specific incidence rate ratios estimated with log linear Poisson regression models adjusted for age, calendar period, education, and disposable income.
Results 358 403 subscription holders accrued 3.8 million person years. In the follow-up period 1990-2007, there were 10 729 cases of tumours of the central nervous system. The risk of such tumours was close to unity for both men and women. When restricted to individuals with the longest mobile phone use—that is, ≥13 years of subscription—the incidence rate ratio was 1.03 (95% confidence interval 0.83 to 1.27) in men and 0.91 (0.41 to 2.04) in women. Among those with subscriptions of ≥10 years, ratios were 1.04 (0.85 to 1.26) in men and 1.04 (0.56 to 1.95) in women for glioma and 0.90 (0.57 to 1.42) in men and 0.93 (0.46 to 1.87) in women for meningioma. There was no indication of dose-response relation either by years since first subscription for a mobile phone or by anatomical location of the tumour—that is, in regions of the brain closest to where the handset is usually held to the head.
Conclusions In this update of a large nationwide cohort study of mobile phone use, there were no increased risks of tumours of the central nervous system, providing little evidence for a causal association.

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