Because there were few cases close to the transmitter, the sta- tistical test used shows a weak decline in risk due to the risk falling from distances of 2 to 3 km out to the edge of the circle, with borderline significance (p= 0.05).
20 transmitter studies gave some evidence of a decreasing trend with residence, although the effect was small and there was no excess in those who live closest to the transmitter (35).
Of 11 types of cancer assessed, two showed a significant trend in incidence with distance from the trans- mitter (melanoma and bladder cancer).
They found a weak trend near the Crystal Palace transmitter, which does not transmit FM, as well as near FM transmitters.
The regression trend for ALL incidence against estimated RFR exposure based on all LGAs gave a relative risk of 1.45 (95% confi- dence limits 0.96-2.19) for a change in RFR exposure of 1 jiW/cm2; that is, an almost significant positive association.
In terms of spe- cific exposures, significant excess risks were seen with exposures to formaldehyde, pes- ticides, carbon tetrachloride, asbestos, and a marginally significant excess risk seen with exposure to antifreeze.