Relative validity and repeatability in a Spanish population with metabolic syndrome from the PREDIMED-PLUS study

Cíntia Ferreira-Pêgo, Mariela Nissensohn, Stavros A. Kavouras, Nancy Babio, Lluís Serra-Majem, Adys Martín Águila, Andy Mauromoustakos, Jacqueline Álvarez Pérez, Jordi Salas-Salvadó

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


We assess the repeatability and relative validity of a Spanish beverage intake questionnaire for assessing water intake from beverages. The present analysis was performed within the framework of the PREDIMED-PLUS trial. The study participants were adults (aged 55-75) with a BMI ≥27 and <40 kg/m2, and at least three components of Metabolic Syndrome (MetS). A trained dietitian completed the questionnaire. Participants provided 24-h urine samples, and the volume and urine osmolality were recorded. The repeatability of the baseline measurement at 6 and 1 year was examined by paired Student’s t-test comparisons. A total of 160 participants were included in the analysis. The Bland-Altman analysis showed relatively good agreement between total daily fluid intake assessed using the fluid-specific questionnaire, and urine osmolality and 24-h volume with parameter estimates of –0.65 and 0.22, respectively (R2 = 0.20; p < 0.001). In the repeatability test, no significant differences were found between neither type of beverage nor total daily fluid intake at 6 months and 1-year assessment, compared to baseline. The proposed fluid-specific assessment questionnaire designed to assess the consumption of water and other beverages in Spanish adult individuals was found to be relatively valid with good repeatability.

Original languageEnglish (US)
Article number475
Issue number8
StatePublished - Aug 2016
Externally publishedYes


  • Beverage
  • Fluid questionnaire
  • Relative validity
  • Repeatability
  • Spain

ASJC Scopus subject areas

  • Food Science
  • Nutrition and Dietetics


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