Further results of this Danish cohort study are published in Johansen et al (2001), Schüz et al (2006), and Schüz et al (2011).
To obtain information on highest attained education and disposable income, the data were linked to a cohort study on social inequality and cancer.
|Reference group 1||non-subscribers|
|Group 3||subscribers: 1 - 4 years of subscription|
|Group 4||subscribers: 5 - 9 years of subscription|
|Group 5||subscribers: ≥ 10 years of subscription|
|Group 6||subscribers: 10 - 12 years of subscription|
|Group 7||subscribers: ≥ 13 years of subscription|
No overall increased risk of brain tumors or for all cancers combined associated with use of mobile phones was observed. No dose-response relation was found with regard to years of subscription or to the anatomical site of the glioma.
The authors concluded that in this update of a large nationwide cohort study of mobile phone use, there was no increased risk of brain tumors, providing little evidence for a causal association.