It has been known for some time that radio energy can heat and thereby damage cell tissue. Engineers have proposed levels of radiation that will not cause harmful heating. ANSI revised the standard for cellular radiation to reduced levels in 1992. The FCC has accepted the ANSI standard and requires manufactures to test to that level. The non-heating effects of cellular radio radiation have been the topic of substantial media attention.
Epidemiologists look at the health patterns of large groups of people using statistical methods.
They generally regard a risk ratio of 4.0 or greater to be indicative of a strong association between the cause and effect under study. Dr. Carlo says that the data gathered in his study shows that there is evidence of a causal connection between cellular telephone use and brain cancer. Researchers for the wireless industry rely on the same data to say that the study results are inconclusive. That is, the results do not say that exposure to cellular radiation does or does not cause cancer. This is a far cry from saying that there is no causal connection and is of little comfort.