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, 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

Abstract

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.

Keywords: FFQ; MEDAS; Mediterranean diet; Portugal; epidemiology; nutrition; telephone.

Conflict of interest statement

The authors do not have any conflict of interest to declare.

Figures

Figure 1
Figure 1
Flowchart of the validation study of a telephone-administered version of the Mediterranean Diet Adherence Screener (MEDAS) questionnaire in the adult Portuguese population.

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