[ELF-MF occupational exposure: repeated measures on workers].

Abstract

The aim of our study was to estimate occupational exposure to Extremely Low Frequency-Magnetic Fields (ELF-MF). Using personal dosimeters we evaluated occupational exposure in 543 workers employed in 9 occupational settings (about 150 jobs), representative of the main occupational activities in Emilia-Romagna region. In the whole sample, the median Time-Weighted Average (TWA) exposure resulted 0.14 microT (5 degrees - 95 degrees percentiles: 0.04 - 2.50 microT); Tile production presented the highest occupational setting TWA (0.46 +/- 1.83 microT), while the lower job TWA was Stock Clerk in Tile Production and Stock Clerk in Garment Production. After 6-9 months we repeated measurement in about 10% of the original sample (about 48 subjects) to verify the resulted obtained. At repeated measurement analysis with SPSS 12.0 no variation was found compared the previous monitoring. Individual occupational exposure to ELF-MF evaluated in a relatively large group of workers engaged in the main occupational activities proved low values compared to the proposed occupational limit.

AI evidence extraction

Main findings

In 543 workers, the median TWA ELF-MF exposure was 0.14 microT (5th–95th percentiles: 0.04–2.50 microT). Tile production had the highest occupational setting TWA (0.46 ± 1.83 microT). Repeat measurements in ~48 subjects after 6–9 months showed no variation compared with prior monitoring; exposures were described as low compared with proposed occupational limits.

Outcomes measured

• Personal dosimeter-measured ELF magnetic field exposure (Time-Weighted Average, microT)
• Repeatability of exposure measurements after 6–9 months (subset)

Limitations

• Frequency characteristics of ELF-MF not reported
• Details of dosimeter model/measurement protocol not provided in abstract
• Repeat measurements conducted in only ~10% of the sample (~48 subjects)
• No health outcomes assessed; exposure-only study

Suggested hubs

• occupational-exposure (0.95)
  Study measures ELF magnetic field exposure in multiple occupational settings using personal dosimeters.

{
    "study_type": "exposure_assessment",
    "exposure": {
        "band": "ELF",
        "source": "occupational",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "personal dosimetry; repeated after 6–9 months in ~10%"
    },
    "population": "Workers in Emilia-Romagna region (Italy) across 9 occupational settings (~150 jobs)",
    "sample_size": 543,
    "outcomes": [
        "Personal dosimeter-measured ELF magnetic field exposure (Time-Weighted Average, microT)",
        "Repeatability of exposure measurements after 6–9 months (subset)"
    ],
    "main_findings": "In 543 workers, the median TWA ELF-MF exposure was 0.14 microT (5th–95th percentiles: 0.04–2.50 microT). Tile production had the highest occupational setting TWA (0.46 ± 1.83 microT). Repeat measurements in ~48 subjects after 6–9 months showed no variation compared with prior monitoring; exposures were described as low compared with proposed occupational limits.",
    "effect_direction": "no_effect",
    "limitations": [
        "Frequency characteristics of ELF-MF not reported",
        "Details of dosimeter model/measurement protocol not provided in abstract",
        "Repeat measurements conducted in only ~10% of the sample (~48 subjects)",
        "No health outcomes assessed; exposure-only study"
    ],
    "evidence_strength": "moderate",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "ELF-MF",
        "extremely low frequency",
        "magnetic fields",
        "occupational exposure",
        "personal dosimeters",
        "time-weighted average",
        "repeat measurements",
        "tile production",
        "Emilia-Romagna"
    ],
    "suggested_hubs": [
        {
            "slug": "occupational-exposure",
            "weight": 0.9499999999999999555910790149937383830547332763671875,
            "reason": "Study measures ELF magnetic field exposure in multiple occupational settings using personal dosimeters."
        }
    ]
}

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