A statistical analysis for RF-EMF exposure levels in sensitive land use: A novel study in Greek primary and secondary education schools.

Environmental research · 2020 · No effect · Moderate evidence

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No effectModerate evidencePaper 5619

A random sample of 492 urban Greek primary/secondary schools estimated a mean RF-EMF level of about 0.42 V/m for sources in the 27 MHz–3 GHz range (95% CI: 0.4024 to 0.4395 V/m). Reported exposure levels at tested locations were below 60% of the highest ICNIR…

Study snapshot

PublicationEnvironmental research · 2020

Study typeexposure_assessment

Reported directionNo effect

Evidence ratingModerate

Abstract

BACKGROUND: The increasing popularity of mobile phones and the expansion of network infrastructure in Greece have given rise to public concerns about potential adverse health effects on sensitive groups, such as children, from long-term radio-frequency (RF) electromagnetic fields (EMFs) exposure. According to Greek law the RF limit values for sensitive land use (schools, hospitals, etc) have been set to 60% of those recommended by EU standard and 70% for the general population. AIMS: The objective of this study is to estimate mean RF-EMF exposure levels of Greek primary and secondary edu-cation schools located in urban environments. METHODS: In selecting the minimum sample size we observed that the variance of the random variable was unknown, as there has been no similar previous study in Greece with schools as the target population. For this reason, a pilot study was conducted in 65 schools in order to estimate the standard deviation of the population and use that value to calculate the minimum sample size. Using a random machine num-ber generator contracted in R based on pseudo-random number algorithms, we obtained a sample of 492 schools in order to estimate the mean value for RF-EMF radiation sources in the 27 MHz-3GHz range in schools within urban environments in Greece. RESULTS: We have performed the appropriate hypothesis test to get that there is sufficient evidence at the α = 0.05 level to conclude that the mean value for RF-EMF radiation sources in the 27 MHz-3GHz range, in schools within urban environments in Greece, is equal to 0.42 V/m, also a 95% confidence interval for the mean value is (0.4024, 0.4395)] with central value equal to the sample mean 0.4209. CONCLUSION: In conclusion, the exposure level in the locations tested are both below 60% of the highest limit set by ICNIRP (International Commision on Non-Ionizing Radiation Protection) regarding sensitive land use.

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 typeexposure_assessment

Effect directionno_effect

PopulationGreek primary and secondary education schools in urban environments

Sample size492

ExposureRF

Evidence strengthModerateConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Mean RF-EMF exposure level (V/m) in 27 MHz–3 GHz range
95% confidence interval for mean exposure (V/m)
Comparison to regulatory/ICNIRP-based limits for sensitive land use

Limitations

Variance initially unknown; required a pilot study (65 schools) to estimate standard deviation for sample size calculation
Study limited to schools located in urban environments in Greece
Exposure metric reported as mean V/m across 27 MHz–3 GHz; other exposure characteristics not described in abstract

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "schools (sensitive land use); RF-EMF radiation sources in urban environments",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Greek primary and secondary education schools in urban environments",
  "sample_size": 492,
  "outcomes": [
    "Mean RF-EMF exposure level (V/m) in 27 MHz–3 GHz range",
    "95% confidence interval for mean exposure (V/m)",
    "Comparison to regulatory/ICNIRP-based limits for sensitive land use"
  ],
  "main_findings": "A random sample of 492 urban Greek primary/secondary schools estimated a mean RF-EMF level of about 0.42 V/m for sources in the 27 MHz–3 GHz range (95% CI: 0.4024 to 0.4395 V/m). Reported exposure levels at tested locations were below 60% of the highest ICNIRP limit for sensitive land use.",
  "effect_direction": "no_effect",
  "limitations": [
    "Variance initially unknown; required a pilot study (65 schools) to estimate standard deviation for sample size calculation",
    "Study limited to schools located in urban environments in Greece",
    "Exposure metric reported as mean V/m across 27 MHz–3 GHz; other exposure characteristics not described in abstract"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "RF-EMF",
    "radio-frequency electromagnetic fields",
    "exposure assessment",
    "schools",
    "children",
    "sensitive land use",
    "Greece",
    "urban environments",
    "27 MHz-3 GHz",
    "ICNIRP",
    "V/m"
  ],
  "suggested_hubs": [
    {
      "slug": "school-wi-fi",
      "weight": 0.62,
      "reason": "Study assesses RF-EMF exposure levels in primary and secondary schools (sensitive land use)."
    },
    {
      "slug": "who-icnirp",
      "weight": 0.55,
      "reason": "Findings are interpreted relative to ICNIRP limit values for sensitive land use."
    }
  ]
}

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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: 10.1016/j.envres.2020.109940
PubMed: 33181972

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