Regular use of mobile phone was defined as use of a mobile phone on average once per week during 6 months or more one year prior diagnosis.
The study is based on the Danish and Swedish parts of the INTERPHONE project (publications 11887, 10496, 11648, and 9105).
|Reference group 1||never or nonregular use|
|Group 2||regular use|
|Group 3||duration of use < 5 years|
|Group 4||duration of use 5-9 years|
|Group 5||duration of use ≥ 10 years|
|Group 6||time since first regular use < 5 years|
|Group 7||time since first regular use 5-9 years|
|Group 8||time since first regular use ≥ 10 years|
|Group 9||cumulative use < 30 hours|
|Group 10||cumulative use 30-449 hours|
|Group 11||cumulative use ≥ 450 hours|
|Group 12||cumulative number of calls ≤ 624|
|Group 13||cumulative number of calls 625-7349|
|Group 14||cumulative number of calls ≥ 7350|
|Reference group 15||ipsilateral exposure: no use or contralateral use|
|Group 16||ipsilateral exposure: regular use|
|Reference group 17||contralateral exposure: no use or ipsilateral use|
|Group 18||contralateral exposure: regular use|
|Participation rate||85 %||70 %|
No increased risk for regular mobile phone use and parotid gland tumors was observed, regardless of duration. The risk estimate did not increase with the amount of use nor for use mainly in rural or urban areas. Analyses of digital and analog mobile phone use separately did not show any increased risks.
The results do not support the hypothesis that exposure to electromagnetic fields generated by mobile phones increase the risk of malignant or benign parotid gland tumors.