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Elevated risk of Alzheimer's disease among workers with likely electromagnetic field exposure.

Neurology · 1996 · Harm · Low evidence

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HarmLow evidencePaper 4216

In this clinic-based case-control study of occupations with likely electromagnetic field exposure, the adjusted odds ratio for Alzheimer's disease for both sexes combined was 3.93 (p=0.006; 95% CI 1.5–10.6). Sex-stratified adjusted odds ratios were 4.90 for m…

Study snapshot

PublicationNeurology · 1996
Study typecase_control
Reported directionHarm
Evidence ratingLow

Abstract

We conducted a case-control study of the possible association of occupations with likely exposure to electromagnetic fields and Alzheimer's disease (AD) with patients from the Alzheimer Disease Treatment and Diagnostic Center, Rancho Los Amigos Medical Center, Downey, CA. Patients with definite or probable AD were the case subjects (86 male, 240 female). Patients with cognitive impairment/dementia other than vascular dementia were control subjects (76 male, 76 female). The study was limited to patients who were at least age 65 at the time of their first examination at Rancho Los Amigos. The odds ratio for both sexes combined was adjusted for sex, education, and age at onset. The odds ratio for males was adjusted only for age at onset, and the odds ratio for females was adjusted for both education and age at onset. The adjusted odds ratio for both sexes was 3.93 (p = 0.006), 95% CI = (1.5 to 10.6). For males the adjusted odds ratio was 4.90 (p = 0.01), 95% CI = (1.3 to 7.9), and for females the adjusted odds ratio was 3.40 (p = 0.10), 95% CI = (0.8 to 16.0). These results are consistent with previous findings regarding the hypothesis that electromagnetic field exposure is etiologically associated with the occurrence of 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 directionharm
PopulationPatients aged ≥65 examined at the Alzheimer Disease Treatment and Diagnostic Center, Rancho Los Amigos Medical Center (Downey, CA); cases: definite/probable Alzheimer's disease; controls: cognitive impairment/dementia other than vascular dementia.
Sample size478
ExposureNot supplied
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In this clinic-based case-control study of occupations with likely electromagnetic field exposure, the adjusted odds ratio for Alzheimer's disease for both sexes combined was 3.93 (p=0.006; 95% CI 1.5–10.6). Sex-stratified adjusted odds ratios were 4.90 for males (p=0.01; 95% CI 1.3–7.9) and 3.40 for females (p=0.10; 95% CI 0.8–16.0).

Outcomes measured

  • Alzheimer's disease (definite or probable) vs other cognitive impairment/dementia (excluding vascular dementia)

Limitations

  • Exposure characterized as 'occupations with likely exposure' (no quantitative EMF measurements reported in abstract).
  • Clinic-based sample from a single center; generalizability may be limited.
  • Control group consisted of other cognitive impairment/dementia patients (excluding vascular dementia), not population controls.
  • Female estimate not statistically significant (p=0.10) with wide confidence interval.
View raw extracted JSON
{
  "study_type": "case_control",
  "exposure": {
    "band": null,
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Patients aged ≥65 examined at the Alzheimer Disease Treatment and Diagnostic Center, Rancho Los Amigos Medical Center (Downey, CA); cases: definite/probable Alzheimer's disease; controls: cognitive impairment/dementia other than vascular dementia.",
  "sample_size": 478,
  "outcomes": [
    "Alzheimer's disease (definite or probable) vs other cognitive impairment/dementia (excluding vascular dementia)"
  ],
  "main_findings": "In this clinic-based case-control study of occupations with likely electromagnetic field exposure, the adjusted odds ratio for Alzheimer's disease for both sexes combined was 3.93 (p=0.006; 95% CI 1.5–10.6). Sex-stratified adjusted odds ratios were 4.90 for males (p=0.01; 95% CI 1.3–7.9) and 3.40 for females (p=0.10; 95% CI 0.8–16.0).",
  "effect_direction": "harm",
  "limitations": [
    "Exposure characterized as 'occupations with likely exposure' (no quantitative EMF measurements reported in abstract).",
    "Clinic-based sample from a single center; generalizability may be limited.",
    "Control group consisted of other cognitive impairment/dementia patients (excluding vascular dementia), not population controls.",
    "Female estimate not statistically significant (p=0.10) with wide confidence interval."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "Alzheimer's disease",
    "occupational exposure",
    "electromagnetic fields",
    "case-control",
    "odds ratio",
    "dementia"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.9,
      "reason": "Study evaluates occupations with likely EMF exposure in relation to Alzheimer's disease risk."
    }
  ]
}
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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: 10.1212/wnl.47.6.1477
PubMed: 8960730

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