Validation of the telephone-administered version of the mediterranean diet adherence screener (Medas) questionnaire

Maria João Gregório, Ana M. Rodrigues, Clara Salvador, Sara S. Dias, Rute D. de Sousa, Jorge M. Mendes, Pedro S. Coelho, Jaime C. Branco, Carla Lopes, Miguel A. Martínez-González, Pedro Graça, Helena Canhão

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A 14-Item Mediterranean Diet Adherence Screener (MEDAS) questionnaire was developed and validated in face-to-face interviews, but not via telephone. The aims of this study were to evaluate the validity and reliability of a telephone-administered version of the MEDAS as well as to validate the Portuguese version of the MEDAS questionnaire. A convenience community-based sample of adults (n = 224) participated in a three-stage survey. First, trained researchers administered MEDAS via a telephone. Second, the Portuguese version of Food Frequency Questionnaire (FFQ), and MEDAS were administered in a semi-structured face-to-face interview. Finally, MEDAS was again administered via telephone. The telephone-administered MEDAS questionnaire was compared with the face-to-face-version using several metrics. The telephone-administered MEDAS was significantly correlated with the face-to-face-administered MEDAS [r = 0.805, p < 0.001; interclass correlation coefficient (ICC) = 0.803, p < 0.001] and showed strong agreement (k = 0.60). The MEDAS scores that were obtained in the first and second telephone interviews were significantly correlated (r = 0.661, p < 0.001; ICC = 0.639, p < 0.001). The overall agreement between the Portuguese version of MEDAS and the FFQ-derived Mediterranean diet adherence score had a Cohen’s k = 0.39. The telephone-administered version of MEDAS is a valid tool for assessing the adherence to the Mediterranean diet and acquiring data for large population-based studies.

Original languageEnglish
Article number1511
Issue number5
Publication statusPublished - May 2020


  • Epidemiology
  • FFQ
  • Mediterranean diet
  • Nutrition
  • Portugal
  • Telephone

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