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Occupational exposure to electromagnetic fields and Alzheimer disease.

Alzheimer disease and associated disorders · 1999 · No effect · Low evidence

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No effectLow evidencePaper 5367

In conditional logistic regression analyses stratified by industrial hygienist (IH) rater and adjusted for age and education, odds ratios for ever having been exposed to EMF were 0.74 (95% CI 0.29–1.92) and 0.95 (95% CI 0.27–2.43). No dose-response effect was…

Study snapshot

PublicationAlzheimer disease and associated disorders · 1999
Study typecase_control
Reported directionNo effect
Evidence ratingLow

Abstract

The association between occupational exposure to electromagnetic fields (EMF) and Alzheimer disease (AD) was examined. Subjects were identified from a large health maintenance organization in Seattle, Washington, and matched by age, sex, and proxy type. A complete occupational history was obtained from proxies and controls. Following the interview, two industrial hygienists (IHs) rated exposures to EMF for each job blinded to case-control status. Exposures to EMF were rated as probable intermittent exposure or probable exposure for extended periods to levels above threshold. Conditional logistic regression was used to calculate the risk of AD given EMF exposure stratified by IH. The odds ratios for ever having been exposed to EMF were 0.74 [95% confidence interval (CI) 0.29-1.92] and 0.95 (95% CI 0.27-2.43) for each IH, adjusting for age and education. No dose-response effect was noted. Agreement between the two IHs for ever having been exposed to EMF was good (kappa = 0.57, p < 0.0001). This study was unable to support an association between EMF and AD.

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
PopulationSubjects from a large health maintenance organization in Seattle, Washington; Alzheimer disease cases and matched controls (matched by age, sex, and proxy type).
Sample sizeNot supplied
ExposureNot supplied
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In conditional logistic regression analyses stratified by industrial hygienist (IH) rater and adjusted for age and education, odds ratios for ever having been exposed to EMF were 0.74 (95% CI 0.29–1.92) and 0.95 (95% CI 0.27–2.43). No dose-response effect was observed, and the study did not support an association between occupational EMF exposure and AD.

Outcomes measured

  • Alzheimer disease (AD) risk

Limitations

  • Exposure assessment was based on proxy-reported occupational histories and expert (industrial hygienist) ratings rather than direct measurements.
  • Exposure categorization was qualitative (e.g., probable intermittent vs probable extended exposure above threshold) with thresholds not specified in the abstract.
  • Results differed somewhat by IH rater (stratified analyses), indicating potential exposure classification variability.
View raw extracted JSON
{
  "study_type": "case_control",
  "exposure": {
    "band": null,
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Subjects from a large health maintenance organization in Seattle, Washington; Alzheimer disease cases and matched controls (matched by age, sex, and proxy type).",
  "sample_size": null,
  "outcomes": [
    "Alzheimer disease (AD) risk"
  ],
  "main_findings": "In conditional logistic regression analyses stratified by industrial hygienist (IH) rater and adjusted for age and education, odds ratios for ever having been exposed to EMF were 0.74 (95% CI 0.29–1.92) and 0.95 (95% CI 0.27–2.43). No dose-response effect was observed, and the study did not support an association between occupational EMF exposure and AD.",
  "effect_direction": "no_effect",
  "limitations": [
    "Exposure assessment was based on proxy-reported occupational histories and expert (industrial hygienist) ratings rather than direct measurements.",
    "Exposure categorization was qualitative (e.g., probable intermittent vs probable extended exposure above threshold) with thresholds not specified in the abstract.",
    "Results differed somewhat by IH rater (stratified analyses), indicating potential exposure classification variability."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "occupational exposure",
    "electromagnetic fields",
    "EMF",
    "Alzheimer disease",
    "case-control",
    "industrial hygienist rating",
    "conditional logistic regression",
    "proxy interview"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.95,
      "reason": "Examines occupational EMF exposure in relation to Alzheimer disease using a case-control design."
    }
  ]
}
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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: 10.1097/00002093-199907000-00009
PubMed: 10485576

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