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How Valid are Web-Based Self-Reports of Weight?
Karolinska Inst, Dept Med Epidemiol & Biostat, SE-17177 Stockholm, Sweden..
Karolinska Inst, Dept Med, Clin Epidemiol Unit, SE-17177 Stockholm, Sweden..
Karolinska Inst, Dept Med Epidemiol & Biostat, SE-17177 Stockholm, Sweden..ORCID iD: 0000-0003-2046-5641
2013 (English)In: Journal of Medical Internet Research, ISSN 1438-8871, E-ISSN 1438-8871, Vol. 15, no 4, article id UNSP e52Article in journal (Refereed) Published
Abstract [en]

Background: Many studies rely on self-reported anthropometric data. While paper-based self-reports have been the standard collection mode, the number of studies collecting self-reported data via the Web is increasing rapidly. Although numerous studies have shown good agreement between self-reported and measured weight using paper-based questionnaires, the validity of using the Web to inquire about weight is unknown. Objective: The objective of this study was to validate Web-based self-reports of bodyweight compared to weight measured at the study center. Methods: The validity of weight self-reported via the Web was assessed by comparing self-reports against measurements of weight in a convenience sample of 149 individuals (77.2% women, 115/149), aged 20-65 years. Study participants self-reported their weight via a Web-based questionnaire and thereafter had their weight measured in the research center. Results: The Spearman correlation coefficient between self-reported and measured weight was 0.98 (P<.001). The mean difference between self-reported and measured weight was -1.2 (SD 2.6) kg. There was a statistically significant difference between self-reported and measured weight with the self-reported being lower (P<.001). Subjects with a body mass index (BMI) >= 25 kg/m(2), and subjects >= 30 years of age, under-reported their weight statistically significantly more than subjects with a BMI <25 kg/m(2), and subjects <30 years of age, respectively. Conclusions: Our results show that self-reported weight via the Web can be a valid method of data collection.

Place, publisher, year, edition, pages
JMIR PUBLICATIONS, INC , 2013. Vol. 15, no 4, article id UNSP e52
Keywords [en]
body weight, Internet, validity
National Category
Health Sciences
Identifiers
URN: urn:nbn:se:mdh:diva-40685DOI: 10.2196/jmir.2393ISI: 000319443800008PubMedID: 23570956OAI: oai:DiVA.org:mdh-40685DiVA, id: diva2:1246020
Available from: 2018-09-06 Created: 2018-09-06 Last updated: 2018-09-06Bibliographically approved

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