Occupational and Environmental Medicine. 2005 Jun;62(6):390-4
Use of cellular telephones and brain tumour risk in
urban and rural areas
Hardell L, Carlberg M, Hansson Mild K
Department of Oncology, University Hospital, Orebro, Sweden

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Aims: To investigate the association between the use of cellular or cordless telephones and the risk for brain tumours in different geographical areas, urban and rural.
 
Methods: Patients aged 20-80 years, living in the middle part of Sweden, and diagnosed between 1 January 1997 and 30 June 2000 were included. One control matched for sex and age in five year age groups was selected for each case. Use of different phone types was assessed by a questionnaire.
 
Results: The number of participating cases was 1429; there were 1470 controls. An effect of rural living was most pronounced for digital cellular telephones. Living in rural areas yielded an odds ratio (OR) of 1.4 (95% CI 0.98 to 2.0), increasing to 3.2 (95% CI 1.2 to 8.4) with >5 year latency time for digital phones. The corresponding ORs for living in urban areas were 0.9 (95% CI 0.8 to 1.2) and 0.9 (95% CI 0.6 to 1.4), respectively. This effect was most obvious for malignant brain tumours.
 
Conclusion: In future studies, place of residence should be considered in assessment of exposure to microwaves from cellular telephones, although the results in this study must be interpreted with caution due to low numbers in some of the calculations.

Kommentar: Studien visar tydligt att ökad strålning ger ökad risk. På landsbygden är det längre till mobilmasterna och telefonen ökar därför strålningen så att den når fram till masten och basstationen. Man kan då dra slutsatsen att det skulle vara bra om det var tätt mellan mobilmasterna, men tyvärr ökar då strålningen från basstationerna istället, se sidan Sändareffekter.