Should the threshold limit value for power frequency (60 Hz) magnetic fields be changed? Perceptions among scientists and other risk experts.

AIHA journal : a journal for the science of occupational and environmental health and safety · 2002 · Unclear · Low evidence

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UnclearLow evidencePaper 5285

Study snapshot

PublicationAIHA journal : a journal for the science of occupational and environmental health and safety · 2002

Study typecross_sectional

Reported directionUnclear

Evidence ratingLow

Abstract

Over the past few years several studies have raised questions about childhood cancer and exposure to electric and magnetic fields (EMFs). Reports by the National Academy of Sciences and the National Cancer Institute concluded that there is no clear, convincing evidence that exposure to electric power lines and electric power appliances is a threat to human health, whereas the National Institute of Environmental Health Sciences concluded that there is weak evidence that EMF exposure may be a leukemia hazard. Based on the conflicting agency reports on EMF, what do experts in the field of bioelectromagnetics believe regarding the effectiveness of the American Conference of Governmental Industrial Hygienists (ACGIH) guidelines? Surveys were sent to 163 participants at the 1997 annual Department of Energy Contractors meeting on Electric and Magnetic Fields. Approximately one-half (49%, n = 81) of the participants returned the survey. Utility workers demonstrated greater levels of agreement with the current TLV standard in comparison to government, university, and other private sector workers. Utility workers were less likely to perceive that ACGIH guidelines should be changed to be made more strict. In addition, workers who had worked at their present job for 10 years or more indicated less agreement with the acceptability of ACGIH guidelines to protect workers' health. The scientists and other risk experts in this study illustrate the importance of how type of industry may influence perceptions of TLV effectiveness.

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 typecross_sectional

Effect directionunclear

PopulationParticipants at the 1997 annual Department of Energy Contractors meeting on Electric and Magnetic Fields (scientists and other risk experts; includes utility, government, university, and private sector workers)

Sample size81

ExposureELF

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Surveys were sent to 163 meeting participants and 49% (n=81) responded. Utility workers showed greater agreement with the current TLV standard and were less likely to perceive that ACGIH guidelines should be changed to be more strict compared with government, university, and other private sector workers. Workers with 10 years or more at their present job indicated less agreement with the acceptability of ACGIH guidelines to protect workers' health.

Outcomes measured

Perceptions of effectiveness/acceptability of ACGIH guidelines (TLV) for 60 Hz magnetic fields
Perceptions of whether ACGIH guidelines should be changed (made more strict)

Limitations

Survey response rate was 49% (potential nonresponse bias)
Findings reflect perceptions among meeting participants and may not generalize to all scientists/risk experts
No direct health outcomes or exposure measurements reported in the abstract

View raw extracted JSON

{
  "study_type": "cross_sectional",
  "exposure": {
    "band": "ELF",
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Participants at the 1997 annual Department of Energy Contractors meeting on Electric and Magnetic Fields (scientists and other risk experts; includes utility, government, university, and private sector workers)",
  "sample_size": 81,
  "outcomes": [
    "Perceptions of effectiveness/acceptability of ACGIH guidelines (TLV) for 60 Hz magnetic fields",
    "Perceptions of whether ACGIH guidelines should be changed (made more strict)"
  ],
  "main_findings": "Surveys were sent to 163 meeting participants and 49% (n=81) responded. Utility workers showed greater agreement with the current TLV standard and were less likely to perceive that ACGIH guidelines should be changed to be more strict compared with government, university, and other private sector workers. Workers with 10 years or more at their present job indicated less agreement with the acceptability of ACGIH guidelines to protect workers' health.",
  "effect_direction": "unclear",
  "limitations": [
    "Survey response rate was 49% (potential nonresponse bias)",
    "Findings reflect perceptions among meeting participants and may not generalize to all scientists/risk experts",
    "No direct health outcomes or exposure measurements reported in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "60 Hz",
    "power frequency",
    "magnetic fields",
    "ELF",
    "ACGIH",
    "threshold limit value",
    "TLV",
    "occupational exposure",
    "risk perception",
    "survey",
    "utility workers"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.86,
      "reason": "Survey of workers/risk experts regarding occupational TLV guidelines for power-frequency magnetic fields."
    }
  ]
}

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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: 10.1080/15428110208984750
PubMed: 12529919

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