Study type: Epidemiological study (observational study)

Occupational exposure to magnetic fields and the risk of brain tumors. epidem.

Published in: Neuro Oncol 2009; 11 (3): 242-249

Aim of study (acc. to author)

A hospital-based case-control study was conducted in the USA to investigate the association between occupational exposure to extremely low-frequency magnetic fields and the risk of glioma and meningioma.

Endpoint/type of risk estimation

Type of risk estimation: (odds ratio (OR))

Exposure

Assessment

Exposure groups

Group Description
Reference group 1 maximum exposed job: ≤ 0.15 µT
Group 2 maximum exposed job: > 1.5 - 0.3 µT
Group 3 maximum exposed job: ≥ 0.3 µT
Reference group 4 duration > 0.15 µT: 0 year
Group 5 duration > 0.15 µT: > 0 - 15 years
Group 6 duration > 0.15 µT: > 15 years
Reference group 7 lifetime average: ≤ 0.15 µT
Group 8 lifetime average: > 0.15 - 0.3 µT
Group 9 lifetime average: ≥ 0.3 µT
Reference group 10 cumulative exposure > 0.15 µT: 0
Group 11 cumulative exposure > 0.15 µT: > 0 - 0.45 µT-years
Group 12 cumulative exposure > 0.15 µT: > 0.45 µT µT-years

Population

Case group

Control group

Study size

Cases Controls
Eligible 686 799
Other:

489 patients with glioma (including 241 glioblastoma cases) and 197 patients with meningioma

Statistical analysis method: (adjustment: )

Conclusion (acc. to author)

No association was found between the occupational exposure to extremely low frequency magnetic fields and the risk for the brain tumor types glioma and meningioma.

Study funded by

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