To investigate whether continuous low-level radiofrequency electromagnetic fields emitted by base stations of DECT (Digital Enhanced Cordless Telecommunications) cordless phones increase the risk of glioma and meningioma, a population-based case-control study was conducted in Germany.
The German study group supplemented the core questionnaire of the INTERPHONE project to assess the exposure to DECT base stations. The results concerning mobile phones are published in publication 13158.
The exposure measure was the location of a base station of a DECT cordless phone. A subject was classified as exposed if the DECT base station was located 3 m or less away from the subject's bed. Since many subjects could not recall whether their cordless phone was DECT, all information about make and model were used to classify cordless phones into "definitively DECT" and "possibly DECT".
|Reference group 1||definitively DECT: no|
|Group 2||definitively DECT: yes|
|Reference group 3||possibly/definitively DECT: no|
|Group 4||possibly/definitively DECT: yes|
|Reference group 5||time since first exposure (possibly/definitively DECT): no, < 1 year|
|Group 6||time since first exposure (possibly/definitively DECT): 1-4 years|
|Group 7||time since first exposure (possibly/definitively DECT): ≥ 5 years|
|Participation rate||84 %||63 %|
Only few subjects had placed their DECT cordless phone base station close to the bed (definitely: 8 cases and 23 controls, possibly/definitively: 10 cases and 26 controls). The risk of glioma or meningioma was not increased.
No association between continuous low-level radiofrequency electromagnetic fields exposure during the night and the risk of glioma and meningioma was observed.