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Epidemiological study (observational study)

Case-Control Study on Occupational Exposure to Extremely Low-Frequency Electromagnetic Fields and the Association with Meningioma.

Published in: Biomed Res Int 2018; 2018: 5912394

Aim of study (acc. to author)

The association between occupational exposure to extremely low-frequency magnetic fields and meningioma risk was investigated in a case-control study in Sweden.

Endpoint/type of risk estimation

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

Exposure

Assessment

Exposure groups

Reference group 1 cumulative exposure: < 2.33 µT-years
Group 2 cumulative exposure: 2.33 - < 3.79 µT-years
Group 3 cumulative exposure: 3.79 - < 5.55 µT-years
Group 4 cumulative exposure: 5.55 - < 8.52 µT-years
Group 5 cumulative exposure: ≥ 8.52 µT-years
Reference group 6 average exposure: < 0.11 μT
Group 7 average exposure: 0.11 - < 0.13 μT
Group 8 average exposure: 0.13 - < 0.18 μT
Group 9 average exposure: 0.18 - < 0.27 μT
Group 10 average exposure: ≥ 0.27 μT
Reference group 11 maximum exposed job: < 0.13 μT
Group 12 maximum exposed job: 0.13 - < 0.16 μT
Group 13 maximum exposed job: 0.16 - < 0.24 μT
Group 14 maximum exposed job: 0.24 - < 0.60 μT
Group 15 maximum exposed job: ≥ 0.60 μT

Population

  • Group:
    • men
    • women
  • Age: 18–80 years
  • Observation period: 1997 - 2003, 2007 - 2009
  • Study location: Sweden

Case group

Control group

  • Selection:
    • population-based
  • Matching:
    • sex
    • 5-year age group

Study size

Cases Controls
Participants 1,625 3,530
Evaluable 1,592 3,485
Statistical analysis method:
  • unconditional logistic regression
  • restricted cubic spline analysis
( adjustment:
  • age
  • sex
  • socioeconomic status
  • year of diagnosis
)

Conclusion (acc. to author)

No statistically significant increased or decreased risk was found for any of the studied variables (cumulative exposure (group 5 versus group 1): OR 0.9, CI 0.7–1.2; average exposure (group 10 versus group 6): OR 0.9, CI 0.7-1.2; maximum exposed job (group 15 versus group 11): OR 0.8, CI 0.6-1.01).
The authors concluded that no association between occupational exposure to extremely low-frequency magnetic fields and meningioma risk was found.

Study funded by

  • Cancer och Allergifonden (Cancer and Allergy Foundation), Sweden
  • Cancerhjälpen (Cancerhelp), Sweden
  • Pandora Foundation, Germany
  • Kone Foundation, Finland
  • Mr Brian Stein

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