J. Med. Internet Res. - How valid are Web-based self-reports of weight?


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CKGROUND: 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.

Resumo Limpo

ckground mani studi reli selfreport anthropometr data paperbas selfreport standard collect mode number studi collect selfreport data via web increas rapid although numer studi shown good agreement selfreport measur weight use paperbas questionnair valid use web inquir weight unknownobject object studi valid webbas selfreport bodyweight compar weight measur studi centermethod valid weight selfreport via web assess compar selfreport measur weight conveni sampl individu women age year studi particip selfreport weight via webbas questionnair thereaft weight measur research centerresult spearman correl coeffici selfreport measur weight p mean differ selfreport measur weight sd kg statist signific differ selfreport measur weight selfreport lower p subject bodi mass index bmi kgm subject year age underreport weight statist signific subject bmi kgm subject year age respectivelyconclus result show selfreport weight via web can valid method data collect

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