Neurodegenerative disease and magnetic field exposure in UK electricity supply workers

Occup Med (Lond) · 2014 · No effect · Moderate evidence

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No effectModerate evidencePaper 2749

Study snapshot

PublicationOccup Med (Lond) · 2014

Study typecohort

Reported directionNo effect

Evidence ratingModerate

Abstract

Background: Previous research has suggested a possible link between neurodegenerative disease and exposure to extremely low-frequency electric and magnetic fields. Aims: To investigate whether risks of Alzheimer's, motor neurone or Parkinson's disease are related to occupational exposure to magnetic fields. Methods: The mortality experienced by a cohort of 73051 employees of the former Central Electricity Generating Board of England and Wales was investigated for the period 1973-2010. All employees were hired in the period 1952-82, were employed for at least 6 months and had some employment after 1 January 1973. Detailed calculations had been performed by others to enable an assessment to be made of exposures to magnetic fields. Poisson regression was used to calculate relative risks (rate ratios) of developing any of the three diseases under investigation for categories of lifetime, distant (lagged) and recent (lugged) exposure. Results: No statistically significant trends were shown for risks of any of these diseases to increase with estimates of lifetime, recent or distant exposure to magnetic fields. Conclusions: There is no convincing evidence that UK electricity generation and transmission workers have suffered elevated risks from neurodegenerative diseases as a consequence of exposure to magnetic fields.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typecohort

Effect directionno_effect

PopulationEmployees of the former Central Electricity Generating Board of England and Wales (UK electricity generation and transmission workers)

Sample size73051

ExposureELF · Lifetime, distant (lagged) and recent exposure categories assessed; follow-up 1973–2010

Evidence strengthModerateConfidence: 78% · Peer reviewed: yes

Main findings

In Poisson regression analyses, no statistically significant trends were observed for increasing risks of Alzheimer's disease, motor neurone disease, or Parkinson's disease with increasing estimated lifetime, recent, or distant (lagged) occupational magnetic-field exposure. The authors conclude there is no convincing evidence of elevated neurodegenerative disease risks due to magnetic-field exposure in this workforce.

Outcomes measured

Alzheimer's disease mortality
Motor neurone disease mortality
Parkinson's disease mortality

Limitations

Outcome assessed via mortality (not incidence)
Exposure assessment based on calculations performed by others; details not provided in abstract
Specific exposure metrics/levels and category cut-points not reported in abstract

View raw extracted JSON

{
  "study_type": "cohort",
  "exposure": {
    "band": "ELF",
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "Lifetime, distant (lagged) and recent exposure categories assessed; follow-up 1973–2010"
  },
  "population": "Employees of the former Central Electricity Generating Board of England and Wales (UK electricity generation and transmission workers)",
  "sample_size": 73051,
  "outcomes": [
    "Alzheimer's disease mortality",
    "Motor neurone disease mortality",
    "Parkinson's disease mortality"
  ],
  "main_findings": "In Poisson regression analyses, no statistically significant trends were observed for increasing risks of Alzheimer's disease, motor neurone disease, or Parkinson's disease with increasing estimated lifetime, recent, or distant (lagged) occupational magnetic-field exposure. The authors conclude there is no convincing evidence of elevated neurodegenerative disease risks due to magnetic-field exposure in this workforce.",
  "effect_direction": "no_effect",
  "limitations": [
    "Outcome assessed via mortality (not incidence)",
    "Exposure assessment based on calculations performed by others; details not provided in abstract",
    "Specific exposure metrics/levels and category cut-points not reported in abstract"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low-frequency",
    "ELF",
    "magnetic fields",
    "occupational exposure",
    "electricity supply workers",
    "cohort",
    "mortality",
    "Alzheimer's disease",
    "motor neurone disease",
    "Parkinson's disease",
    "Poisson regression"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.95,
      "reason": "Large occupational cohort of electricity generation/transmission workers with magnetic-field exposure assessment and neurodegenerative outcomes."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1093/occmed/kqu105
PubMed: 25104278

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