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Validity and reliability of a dietary assessment method: the application of a digital camera with a mobile phone card attachment.

Journal of nutritional science and vitaminology · 2002 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3820

Median nutrient intakes estimated by the Wellnavi (PDA with camera and mobile phone card) method were comparable to those from a 1-day weighed diet record. Correlations for validity ranged from r=0.46 to r=0.93 (median r=0.77), and reliability correlations be…

Study snapshot

PublicationJournal of nutritional science and vitaminology · 2002
Study typeother
Reported directionUnclear
Evidence ratingInsufficient

Abstract

This study was aimed at evaluation of the validity and reliability of an alternative dietary measurement method that assists epidemiologic studies. We validated a handheld personal digital assistant with camera and mobile phone card, called Wellnavi, in which a 1-d weighed diet record was employed as a reference method. Twenty college students majoring in food and nutrition participated in this study. They were asked to keep a diet record and to take digital photos of all these recorded food at the same time, then send them to the dietitians by the mobile phone card. In the reliability study, other twenty students from the same college were asked to take digital photos of the same meal during a day by two same instruments under the same circumstances and to send these photos to the different dietitians electronically. With respect to validity, median nutrient intakes estimated by the Wellnavi method and the diet record method are comparable. Correlation coefficients between the median nutrient intakes estimated from these two methods ranged from 0.46 for monounsaturated fatty acid to 0.93 for vitamin B12 and copper (median r = 0.77). With respect to reliability, our data show a good agreement between two Wellnavi instruments for most of the nutrients. Correlation coefficients between the nutrient intakes estimated from 2 instruments ranged from 0.55 for vitamin B1 and water-insoluble dietary fiber to 0.92 for vitamin B12 (median r = 0.78). In conclusion, the results indicate this dietary assessment instrument can usefully measure individual dietary intakes for a variety of nutrients in an epidemiologic study.

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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 typeother
Effect directionunclear
PopulationCollege students majoring in food and nutrition
Sample size40
ExposureNot supplied
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Median nutrient intakes estimated by the Wellnavi (PDA with camera and mobile phone card) method were comparable to those from a 1-day weighed diet record. Correlations for validity ranged from r=0.46 to r=0.93 (median r=0.77), and reliability correlations between two instruments ranged from r=0.55 to r=0.92 (median r=0.78), indicating generally good agreement for most nutrients.

Outcomes measured

  • Validity of dietary assessment method (nutrient intake estimates vs 1-day weighed diet record)
  • Reliability/agreement of dietary assessment method between two instruments/dietitians (nutrient intake estimates)

Limitations

  • No EMF exposure or health outcome assessment described in the abstract
  • Small sample sizes (20 participants for validity; 20 for reliability)
  • Reference method limited to a 1-day weighed diet record
View raw extracted JSON
{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "College students majoring in food and nutrition",
  "sample_size": 40,
  "outcomes": [
    "Validity of dietary assessment method (nutrient intake estimates vs 1-day weighed diet record)",
    "Reliability/agreement of dietary assessment method between two instruments/dietitians (nutrient intake estimates)"
  ],
  "main_findings": "Median nutrient intakes estimated by the Wellnavi (PDA with camera and mobile phone card) method were comparable to those from a 1-day weighed diet record. Correlations for validity ranged from r=0.46 to r=0.93 (median r=0.77), and reliability correlations between two instruments ranged from r=0.55 to r=0.92 (median r=0.78), indicating generally good agreement for most nutrients.",
  "effect_direction": "unclear",
  "limitations": [
    "No EMF exposure or health outcome assessment described in the abstract",
    "Small sample sizes (20 participants for validity; 20 for reliability)",
    "Reference method limited to a 1-day weighed diet record"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "dietary assessment",
    "validation study",
    "reliability",
    "digital camera",
    "personal digital assistant",
    "mobile phone card",
    "nutrient intake",
    "weighed diet record",
    "epidemiologic studies"
  ],
  "suggested_hubs": []
}
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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: 10.3177/jnsv.48.498
PubMed: 12775117

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