Heart Rate Variability and Magnetic Field Exposure Among Train Engine Drivers-A Pilot Study

{
  "study_type": "unknown",
  "exposure": {
    "band": null,
    "source": "occupational",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Train engine drivers",
  "sample_size": null,
  "outcomes": [
    "Heart rate variability"
  ],
  "main_findings": null,
  "effect_direction": "unclear",
  "limitations": [
    "No abstract available; study methods, exposure metrics, sample size, and results not provided in the supplied text."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.42,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "heart rate variability",
    "magnetic field exposure",
    "train engine drivers",
    "occupational exposure",
    "pilot study"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.9,
      "reason": "Study concerns magnetic field exposure among train engine drivers (occupational setting)."
    }
  ]
}