Validity of Web-Based Self-Reported Weight and Height: Results of the Nutrinet-Santé Study

Autor: Lassale, Camille, Péneau, Sandrine, Touvier, Mathilde, Julia, Chantal, Galan, Pilar, Hercberg, Serge, Kesse-Guyot, Emmanuelle
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Journal of Medical Internet Research, Vol 15, Iss 8, p e152 (2013)
Druh dokumentu: article
ISSN: 1438-8871
DOI: 10.2196/jmir.2575
Popis: BackgroundWith the growing scientific appeal of e-epidemiology, concerns arise regarding validity and reliability of Web-based self-reported data. ObjectiveThe objectives of the present study were to assess the validity of Web-based self-reported weight, height, and resulting body mass index (BMI) compared with standardized clinical measurements and to evaluate the concordance between Web-based self-reported anthropometrics and face-to-face declarations. MethodsA total of 2513 participants of the NutriNet-Santé study in France completed a Web-based anthropometric questionnaire 3 days before a clinical examination (validation sample) of whom 815 participants also responded to a face-to-face anthropometric interview (concordance sample). Several indicators were computed to compare data: paired t test of the difference, intraclass correlation coefficient (ICC), and Bland–Altman limits of agreement for weight, height, and BMI as continuous variables; and kappa statistics and percent agreement for validity, sensitivity, and specificity of BMI categories (normal, overweight, obese). ResultsCompared with clinical data, validity was high with ICC ranging from 0.94 for height to 0.99 for weight. BMI classification was correct in 93% of cases; kappa was 0.89. Of 2513 participants, 23.5% were classified overweight (BMI≥25) with Web-based self-report vs 25.7% with measured data, leading to a sensitivity of 88% and a specificity of 99%. For obesity, 9.1% vs 10.7% were classified obese (BMI≥30), respectively, leading to sensitivity and specificity of 83% and 100%. However, the Web-based self-report exhibited slight underreporting of weight and overreporting of height leading to significant underreporting of BMI (P
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