Agreement between web-based and paper versions of a socio-demographic questionnaire in the NutriNet-Santé study
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Web-based studies nowadays raise a major interest as they can improve all steps involved in observational studies. Our objective was to compare the web-based version of the NutriNet-Santé self-administered socio-demographic and economic questionnaire with the traditional paper version.
Both versions of the questionnaire were sent to 170 volunteers and filled in by 147 of them (either paper first, n = 76, or web-based first, n = 71). Agreement between versions was assessed by intraclass correlations (ICC) and kappas.
Agreement between both versions was high, with ICC and kappas ranging between 0.81–1.00 and 0.76–1.00, respectively, similarly across groups of administration order, age, gender and self-estimated web knowledge in general. The web-based version was the one preferred by 93.7% of the subjects and enabled to avoid 553 missing values (2.00% of the total entries), 24 inconsistent data (0.09%), 8 aberrant data (0.03%), 472 data entry errors (0.85%) and to save 2,800 € (US $4,072) when sent to 170 subjects.
The web-based socio-demographic and economic questionnaire provided information of similar-to-superior quality compared to the traditional paper version, with substantial logistic and cost advantages.
KeywordsInternet Socio-economical status Epidemiology Web-based questionnaire
We thank all scientists, dieticians, technicians and assistants who helped to carry out the NutriNet-Santé study and the dedicated and conscientious volunteers who participated in this test study. We especially thank Laudine Brico (data manager) for performing the statistical analysis and Gwenael Monot (computer scientist), who coordinates the computing aspects of the NutriNet-Santé study. We thank Voluntis (a healthcare software company) for developing the NutriNet-Santé web-based interface according to our guidelines. This work was supported by the French Ministry of Health (DGS), the Institut de Veille Sanitaire (InVS), the Institut National de Prévention et d’Education pour la Santé (INPES), the Fondation pour la Recherche Médicale (FRM), the Institut National de la Santé et de la Recherche Médicale (Inserm), the Institut de Recherche en Santé Publique (IRESP), the Institut National de la Rechereche Agronomique (Inra), the Conservatoire National des Arts et Métiers (CNAM) and the Paris 13 University.
Conflict of interest
None of the authors had any conflict of interest.
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