Does precautionary information about electromagnetic fields trigger nocebo responses? An experimental risk communication study.

Environmental health : a global access science source · 2018 · No effect · Moderate evidence

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No effectModerate evidencePaper 5544

Study snapshot

PublicationEnvironmental health : a global access science source · 2018

Study typerandomized_trial

Reported directionNo effect

Evidence ratingModerate

Abstract

BACKGROUND: Regarding electromagnetic fields from mobile communication technologies, empirical studies have shown that precautionary information given to lay recipients increases their risk perceptions, i.e. the belief that electromagnetic fields are dangerous. Taking this finding one step further, the current study investigates whether precautionary information also leads to higher symptom perceptions in an alleged exposure situation. Building on existing research on nocebo responses to sham electromagnetic fields, an interaction of the precautionary information with personality characteristics was hypothesised. METHODS: An experimental design with sham exposure to an electromagnetic field of a WLAN device was deployed. The final sample is constituted by N = 137 participants. Participants received either only basic information about the safety of current WLAN exposure limits or in addition also precautionary information (e.g. 'prefer wired connections if wireless technology can be relinquished'). Subsequently, symptoms and other variables were assessed before and after sham exposure to a WLAN electromagnetic field. RESULTS: Results are not in favour of the hypothesised effects. There was neither a main effect of precautionary information, nor were there any of the hypothesised interaction effects of precautionary information and personality characteristics on perceived symptoms under sham exposure. Exploratory analyses highlight the role of prior risk perception as a predictor of nocebo responses, and of symptom expectations as a mediator between these two variables. CONCLUSIONS: As the statistical power to detect even small effects was relatively high, we interpret this as a robust indication that precautionary information does not lead to increased nocebo responses by itself. The implications for health authorities´ communication with the public are discussed.

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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 typerandomized_trial

Effect directionno_effect

PopulationNot supplied

Sample size137

ExposureRF

Evidence strengthModerateConfidence: 78% · Peer reviewed: yes

Main findings

In a sham WLAN EMF exposure experiment (N=137), providing precautionary information in addition to basic safety information did not increase perceived symptoms, and no hypothesized interactions with personality characteristics were observed. Exploratory analyses suggested prior risk perception predicted nocebo responses and symptom expectations mediated the association between risk perception and symptoms.

Outcomes measured

Perceived symptoms under sham exposure
Risk perception
Symptom expectations

View raw extracted JSON

{
  "study_type": "randomized_trial",
  "exposure": {
    "band": "RF",
    "source": "wi-fi",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": 137,
  "outcomes": [
    "Perceived symptoms under sham exposure",
    "Risk perception",
    "Symptom expectations"
  ],
  "main_findings": "In a sham WLAN EMF exposure experiment (N=137), providing precautionary information in addition to basic safety information did not increase perceived symptoms, and no hypothesized interactions with personality characteristics were observed. Exploratory analyses suggested prior risk perception predicted nocebo responses and symptom expectations mediated the association between risk perception and symptoms.",
  "effect_direction": "no_effect",
  "limitations": [],
  "evidence_strength": "moderate",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "electromagnetic fields",
    "EMF",
    "WLAN",
    "Wi-Fi",
    "sham exposure",
    "nocebo",
    "risk communication",
    "precautionary information",
    "symptom perception",
    "risk perception",
    "symptom expectations"
  ],
  "suggested_hubs": [
    {
      "slug": "school-wi-fi",
      "weight": 0.55,
      "reason": "Study uses sham exposure to a WLAN (Wi-Fi) device and evaluates symptom perceptions related to Wi-Fi EMF."
    }
  ]
}

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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: 10.1186/s12940-018-0377-y
PubMed: 29650009

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