Hallberg O (2007):

The author reports that in Sweden, since approximately 1997, a number of health indicators have worsened. This date coincides with the installation of the first 1800 MHz transmission antennas and the first digital television transmitters throughout Sweden. He uses data from Government sources on incidence, mortality, and recovery times after accidents and surgery from all 21 counties in Sweden. These data were correlated with population density and with area coverage by the GSM system.

He reports that people in sparsely populated areas had statistically significant more sick days, chronic illness, mortality due to external causes, recovery time after heart infarct and breast cancer surgery, and overall mortality in different time periods, within the range 1997 to 2004. He also reports that the indicators showed a strong correlation with estimated cell phone area coverage and power output.

Hallberg calls for more research to be done to try to determine the cause of the trends that he reports. He points out that:
"It is axiomatic in statistics that correlation does not imply causation".

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