Risk of cognitive impairment in relation to elevated exposure to electromagnetic fields.

Journal of occupational and environmental medicine · 2002 · No effect · Low evidence

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No effectLow evidencePaper 5309

Study snapshot

PublicationJournal of occupational and environmental medicine · 2002

Study typecase_control

Reported directionNo effect

Evidence ratingLow

Abstract

Occupational exposure to power-frequency electromagnetic fields (PF-EMF) has been suspected of being associated with adverse neurological outcomes. We performed a case-control study to assess the relationship between exposure to PF-EMF and the risk of cognitive impairment, an indication of certain adverse neurological diseases such as Alzheimer's disease and dementia. Among 2198 elderly individuals aged 65 years or older, 290 persons with score-based cognitive impairment were compared with 580 sex-matched controls to assess the risk of cognitive impairment in relation to PF-EMF exposure. Participants who were former electrical workers or living within 100 meters of high-voltage transmission lines were considered to have higher exposure. Compared with background exposure, the risk was equal or close to unity for participants with higher exposure from a previous occupation (odds ratio [OR], 1.3; 95% confidence interval [CI], 0.7 to 2.3), higher residential exposure (OR, 0.9; 95% CI, 0.3 to 2.6), or higher exposure in both occupation and residential environments (OR, 1.0; 95% CI, 0.2 to 4.6). Our findings provide little support for the link between PF-EMF and cognitive impairment. Nevertheless, the study results do not preclude the possible association between PF-EMF and any specific neurodegenerative disease previously investigated.

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 typecase_control

Effect directionno_effect

PopulationElderly individuals aged 65 years or older

Sample size2198

ExposureELF

Evidence strengthLowConfidence: 86% · Peer reviewed: yes

Main findings

In a case-control analysis (290 cognitively impaired vs 580 sex-matched controls), higher PF-EMF exposure defined by former electrical work and/or living within 100 m of high-voltage transmission lines showed odds ratios near unity versus background exposure (occupation OR 1.3, 95% CI 0.7–2.3; residential OR 0.9, 95% CI 0.3–2.6; both OR 1.0, 95% CI 0.2–4.6). The authors report little support for a link between PF-EMF and cognitive impairment, while noting results do not preclude associations with specific neurodegenerative diseases.

Outcomes measured

Cognitive impairment (score-based)

Limitations

Exposure classification based on proxy indicators (former electrical worker; residence within 100 m of high-voltage transmission lines) rather than direct measurements
Outcome is score-based cognitive impairment (not specific neurodegenerative disease diagnosis)
Confidence intervals are wide, suggesting limited precision for some exposure categories

View raw extracted JSON

{
  "study_type": "case_control",
  "exposure": {
    "band": "ELF",
    "source": "occupational and residential (power-frequency EMF; electrical work; proximity to high-voltage transmission lines)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Elderly individuals aged 65 years or older",
  "sample_size": 2198,
  "outcomes": [
    "Cognitive impairment (score-based)"
  ],
  "main_findings": "In a case-control analysis (290 cognitively impaired vs 580 sex-matched controls), higher PF-EMF exposure defined by former electrical work and/or living within 100 m of high-voltage transmission lines showed odds ratios near unity versus background exposure (occupation OR 1.3, 95% CI 0.7–2.3; residential OR 0.9, 95% CI 0.3–2.6; both OR 1.0, 95% CI 0.2–4.6). The authors report little support for a link between PF-EMF and cognitive impairment, while noting results do not preclude associations with specific neurodegenerative diseases.",
  "effect_direction": "no_effect",
  "limitations": [
    "Exposure classification based on proxy indicators (former electrical worker; residence within 100 m of high-voltage transmission lines) rather than direct measurements",
    "Outcome is score-based cognitive impairment (not specific neurodegenerative disease diagnosis)",
    "Confidence intervals are wide, suggesting limited precision for some exposure categories"
  ],
  "evidence_strength": "low",
  "confidence": 0.86,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "power-frequency electromagnetic fields",
    "PF-EMF",
    "occupational exposure",
    "residential exposure",
    "high-voltage transmission lines",
    "electrical workers",
    "cognitive impairment",
    "Alzheimer's disease",
    "dementia",
    "elderly",
    "case-control"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.86,
      "reason": "Study evaluates occupational PF-EMF exposure (former electrical workers) in relation to cognitive impairment."
    }
  ]
}

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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: 10.1097/00043764-200201000-00011
PubMed: 11802468

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