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A cellular phone network mast with different kind of antennas photographed in the summer sun with blue sky and some clouds in the background.
Mobile phone masts are not responsible for the symptoms of ill health some blame them for, a major UK study says.
Dozens of people who believed the masts triggered symptoms such as anxiety, nausea and tiredness could not detect if signals were on or off in trials.
However, the Environmental Health Perspectives study stressed people were nonetheless suffering "real symptoms".
Campaign group Mast Sanity said the results were skewed as 12 people in the trials dropped out because of illness. In the trial, many of those who blame masts for their symptoms reported greater distress when they thought the signal was on, suggesting the problem has a psychological basis. The study was funded by the Mobile Telecommunications and Health Research programme, a body which is itself funded by industry and government.

It is unclear how many people in the UK suffer from "electro-sensitivity", an allergy they believe can be triggered by a range of modern day appliances from hair driers to mobile phone masts. In 2005, the Health Protection Agency (HPA) said there was no scientific evidence to link their ill health with electrical equipment, while acknowledging sufferers could have real and unpleasant symptoms. But the HPA research did not consider the effects of waves from phone masts, as most of the studies looking at electrical sensitivity were carried out before they were widely introduced. A number of studies subsequently have looked at the mobile effect, but the Essex experiments are some of the largest and most detailed to date.
After 12 of the sufferers dropped out of the trial, researchers tested a total of 44 people with a history of symptoms against a control group of 114 people who had never reported ill effects from masts.
When the signal was being emitted, and they were told of this, sensitive individuals reported lower levels of well-being. However, when tests were carried out in which neither the experimenter or participant knew if the mast was on or off, the number of symptoms reported was not related to whether a signal was being emitted or not.

Two of the 44 sensitive individuals correctly judged if it was on or off in all six tests, as did five out of 114 control participants. Dr James Rubin, of the Mobile Phone Research Unit, King's College London, said the findings were in line with those from most other previous experiments. But Mast Sanity declared "history has shown that many now commonly accepted physical conditions were initially dismissed as psychological". But another campaign group, Powerwatch, commended the research as "one of the best designed and executed studies to date" while stressing that the number of dropouts was unfortunate. As well as reporting feeling unwell, sensitive individuals had sweatier skin and higher blood pressure - both measures of a physiological response.

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