One of the glaring omissions of the Interphone cell phone–brain tumor paper is any serious discussion of a similar study by Lennart Hardell's group in Sweden and how they compare (see "Interphone Points to Long-Term Brain Tumor Risks"). Hardell, Michael Carlberg and Kjell Hansson Mild have now filled in the blanks. In a letter to the International Journal of Epidemiology, released today, they present a new analysis of their own data which has been restricted to be consistent with those data collected by the Interphone group. That is, they dropped cases among 20-29 year olds, and the use of cordless phones was disregarded. The bottom line is that the two sets of results are generally consistent with each other. "In conclusion both studies showed a statistically significantly doubled risk for glioma at the same side as the mobile phone had been used for 1,640 hours or more," they state in a press release.
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