Design of an ecological momentary assessment study of exposure to radiofrequency electromagnetic fields and non-specific physical symptoms.

BMJ open · 2013 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 4581

This paper describes the design and planned analysis of an ecological momentary assessment (EMA) study to assess relationships between measured and perceived RF EMF exposure, mood, and non-specific physical symptoms in self-reported RF-EMF-sensitive participa…

Study snapshot

PublicationBMJ open · 2013

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

INTRODUCTION: Idiopathic Environmental Intolerance (IEI) attributed to electromagnetic fields (EMF) refers to self-reported sensitivity mainly characterised by the attribution of non-specific physical symptoms to low-level EMF exposure emitted from sources such as mobile phones. Scientific studies have not provided evidence for the existence of IEI-EMF, but these studies did not resemble the real-life situation or suffered from poor exposure characterisation and biased recall of health symptoms. To improve existing methods for the study of IEI-EMF, an Ecological Momentary Assessment (EMA) study is designed. METHODS AND ANALYSIS: The study is an EMA study in which respondents carry personal exposure metres (exposimeters) that measure radiofrequency (RF) EMF, with frequent assessment of health symptoms and perceived EMF exposure through electronic diary registration during five consecutive days. Participants will be a selection from an epidemiological study who report to be sensitive to RF EMF. The exposimeters measure electric field strength in 12 frequency bands. Diary questions include the occurrence and severity of 10 non-specific physical symptoms, mood states and perceived exposure to (sources of) EMF. The relationship of actual and perceived EMF exposure and mood with non-specific physical symptoms will be analysed using multilevel regression analysis with time-shift models. DISCUSSION: The study has several advantages over previous studies, including assessment of personal EMF exposure and non-specific physical symptoms by an ecological method with a minimised chance of recall bias. The within-person design reduces confounding by time-stable factors (eg, personal characteristics). In the conduct of the study and the analysis and interpretation of its outcomes, some methodological issues including a high participant burden, reactivity, compliance to the study protocol and the potential of chance findings due to multiple statistical testing will be accounted for and limited as much as possible.

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 typeother

Effect directionunclear

PopulationParticipants selected from an epidemiological study who report being sensitive to RF EMF (IEI-EMF)

Sample sizeNot supplied

ExposureRF · five consecutive days

Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Non-specific physical symptoms (occurrence and severity of 10 symptoms)
Perceived EMF exposure (sources)
Mood states
Measured personal RF EMF exposure (electric field strength in 12 frequency bands)

Limitations

No results reported (study design paper)
High participant burden
Potential reactivity
Compliance to the study protocol may be challenging
Potential chance findings due to multiple statistical testing

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "RF",
    "source": "personal exposure metres (exposimeters); sources such as mobile phones",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "five consecutive days"
  },
  "population": "Participants selected from an epidemiological study who report being sensitive to RF EMF (IEI-EMF)",
  "sample_size": null,
  "outcomes": [
    "Non-specific physical symptoms (occurrence and severity of 10 symptoms)",
    "Perceived EMF exposure (sources)",
    "Mood states",
    "Measured personal RF EMF exposure (electric field strength in 12 frequency bands)"
  ],
  "main_findings": "This paper describes the design and planned analysis of an ecological momentary assessment (EMA) study to assess relationships between measured and perceived RF EMF exposure, mood, and non-specific physical symptoms in self-reported RF-EMF-sensitive participants. No study results are reported in the abstract.",
  "effect_direction": "unclear",
  "limitations": [
    "No results reported (study design paper)",
    "High participant burden",
    "Potential reactivity",
    "Compliance to the study protocol may be challenging",
    "Potential chance findings due to multiple statistical testing"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "Idiopathic Environmental Intolerance",
    "IEI-EMF",
    "electromagnetic hypersensitivity",
    "ecological momentary assessment",
    "EMA",
    "radiofrequency",
    "RF EMF",
    "exposimeter",
    "personal exposure measurement",
    "non-specific physical symptoms",
    "perceived exposure",
    "mood",
    "multilevel regression",
    "time-shift models"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "Discusses IEI-EMF and lack of evidence in prior scientific studies; relevant to broader EMF health evidence context."
    }
  ]
}

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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: 10.1136/bmjopen-2013-002933
PubMed: 23988360

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