Long-term recall accuracy for mobile phone calls in young Japanese people

2016 · Unclear · Moderate evidence

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UnclearModerate evidencePaper 1398

Study snapshot

Publicationmanual · 2016

Study typeexposure_assessment

Reported directionUnclear

Evidence ratingModerate

Abstract

Long-term recall accuracy for mobile phone calls in young Japanese people Kiyohara K, Wake K, Watanabe S, Arima T, Sato Y, Kojimahara N, Taki M, Cardis E, Yamaguchi N. Long-term recall accuracy for mobile phone calls in young Japanese people: A follow-up validation study using software-modified phones. J Expo Sci Environ Epidemiol. 2016 Dec 21. doi: 10.1038/jes.2016.73. Abstract This study examined changes in recall accuracy for mobile phone calls over a long period. Japanese students' actual call statuses were monitored for 1 month using software-modified phones (SMPs). Three face-to-face interviews were conducted to obtain information regarding self-reported call status during the monitoring period: first interview: immediately after the monitoring period; second interview: after 10-12 months; third interview: after 48-55 months. Using the SMP records as the "gold standard", phone call recall accuracy was assessed for each interview. Data for 94 participants were analyzed. The number of calls made was underestimated considerably and the duration of calls was overestimated slightly in all interviews. Agreement between self-report and SMP records regarding the number of calls, duration of calls and laterality (i.e., use of the dominant ear while making calls) gradually deteriorated with the increase in the interval following the monitoring period (number of calls: first interview: Pearson's r=0.641, third interview: 0.396; duration of calls: first interview: Pearson's r=0.763, third interview: 0.356; laterality: first interview: weighted-κ=0.677, third interview: 0.448). Thus, recall accuracy for mobile phone calls would be consistently imperfect over a long period, and the results of related epidemiological studies should be interpreted carefully. ncbi.nlm.nih.gov

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 directionunclear

PopulationYoung Japanese students

Sample size94

ExposureRF · Monitoring for 1 month; recall assessed immediately after, 10–12 months after, and 48–55 months after

Evidence strengthModerateConfidence: 78% · Peer reviewed: yes

Main findings

Using software-modified phone records as the gold standard, participants considerably underestimated the number of calls and slightly overestimated call duration in all interviews. Agreement between self-report and phone records for number of calls, call duration, and laterality deteriorated as the time since monitoring increased (e.g., Pearson’s r for number of calls 0.641 immediately vs 0.396 at 48–55 months; duration 0.763 vs 0.356; weighted κ for laterality 0.677 vs 0.448).

Outcomes measured

Recall accuracy of number of mobile phone calls
Recall accuracy of call duration
Recall accuracy of laterality (dominant ear use)

Limitations

Population limited to Japanese students/young people
Self-report compared to records only for a 1-month monitoring period
Recall assessed at specific intervals; other recall periods not evaluated

View raw extracted JSON

{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "Monitoring for 1 month; recall assessed immediately after, 10–12 months after, and 48–55 months after"
  },
  "population": "Young Japanese students",
  "sample_size": 94,
  "outcomes": [
    "Recall accuracy of number of mobile phone calls",
    "Recall accuracy of call duration",
    "Recall accuracy of laterality (dominant ear use)"
  ],
  "main_findings": "Using software-modified phone records as the gold standard, participants considerably underestimated the number of calls and slightly overestimated call duration in all interviews. Agreement between self-report and phone records for number of calls, call duration, and laterality deteriorated as the time since monitoring increased (e.g., Pearson’s r for number of calls 0.641 immediately vs 0.396 at 48–55 months; duration 0.763 vs 0.356; weighted κ for laterality 0.677 vs 0.448).",
  "effect_direction": "unclear",
  "limitations": [
    "Population limited to Japanese students/young people",
    "Self-report compared to records only for a 1-month monitoring period",
    "Recall assessed at specific intervals; other recall periods not evaluated"
  ],
  "evidence_strength": "moderate",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "mobile phone",
    "recall accuracy",
    "validation study",
    "software-modified phones",
    "self-report",
    "call duration",
    "laterality",
    "exposure assessment",
    "epidemiology"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "Relevant to interpretation of epidemiological evidence due to exposure misclassification from self-reported mobile phone 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: 10.1038/jes.2016.73
PubMed: Not supplied

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