[Reproducibility, correlation and concordance of the Abbreviated Dietary Score questionnaire]. / Reproducibilidad, correlación y concordancia de un cuestionario abreviado del Dietary Score.

OBJECTIVE: The objective of this study was to evaluate the reproducibility, correlation and concordance of the abbreviated Dietary Score (aDS) used in the IBERICAN study. MATERIAL AND METHODS: A cross-sectional study was performed in order to assess the reproducibility of the aDS using a test-retest. Its internal consistency was evaluated using Cronbach's alpha, and reliability of the measurements using the intraclass correlation coefficient (ICC). From the food frequency questionnaire (FFQ) of the PREDIMED-Plus study, adherence to a Mediterranean diet pattern was evaluated using DS, and its correlation and agreement with aDS was assessed. In both cases the lineal regression, Bland-Altman, and kappa index techniques were used. RESULTS: A total of 142 subjects participated, mostly men (56.3%), with a mean age of 64.6±4.9 years. In terms of reproducibility, a Pearson correlation coefficient of 0.538 was obtained; a mean of the differences of 2.03 points, and a weighted kappa index of 0.400 (95% CI=0.295-0.577). The instrument had good internal consistency (Cronbach's alpha=0.699), as well as good reliability (CCI=0.931). The aDS had a correlation coefficient with the DS of 0.517, a mean difference of 1.19 points, and a weighted kappa index of 0.450 (95% CI=0.366-0.532). CONCLUSIONS: The aDS has moderate reproducibility and a good correlation and agreement with the DS, so it can be a useful tool in Primary Care to assess adherence to the Mediterranean diet.

Reproducibilidad, correlación y concordancia de un cuestionario abreviado del Dietary Score / Reproducibility, correlation and concordance of the Abbreviated Dietary Score questionnaire

OBJETIVO: El objetivo de este estudio es evaluar la reproducibilidad, la correlación y la concordancia del Dietary Score abreviado (DSa) utilizado en el estudio IBERICAN. MATERIAL Y MÉTODOS: Estudio transversal. Se evaluó la reproducibilidad del DSa mediante una prueba test-retest, evaluando su consistencia interna mediante alfa de Cronbach y la fiabilidad de las mediciones mediante el coeficiente de correlación intraclase (CCI). A partir del cuestionario de frecuencia alimentaria (CFA) del estudio PREDIMED-Plus se evaluó la adherencia a un patrón de dieta mediterránea mediante el DS, valorándose su correlación y concordancia con el DSa. En ambos casos se utilizaron técnicas de regresión lineal, de Bland-Altman e índice de kappa. RESULTADOS: Participaron 142 sujetos, mayoritariamente hombres (56,3%), con una media de edad de 64,6+/-4,9 años. En términos de reproducibilidad, se obtuvo un coeficiente de correlación de Pearson de 0,538; una media de las diferencias de 2,03 puntos y un índice kappa ponderado de 0,400 (IC del 95%=0,295-0,577). El instrumento tuvo buena consistencia interna (alfa de Cronbach=0,699), así como buena fiabilidad (CCI=0,931). El DSa presentó un coeficiente de correlación con el DS de 0,517; una media de las diferencias de 1,19 puntos y un índice kappa ponderado de 0,450 (IC del 95%=0,366-0,532). CONCLUSIONES: El DSa presenta una moderada reproductibilidad y una buena correlación y concordancia con el DS, por lo que puede ser una herramienta útil en Atención Primaria para valorar la adherencia a la dieta mediterránea

OBJECTIVE: The objective of this study was to evaluate the reproducibility, correlation and concordance of the abbreviated Dietary Score (aDS) used in the IBERICAN study. MATERIAL AND METHODS: A cross-sectional study was performed in order to assess the reproducibility of the aDS using a test-retest. Its internal consistency was evaluated using Cronbach's alpha, and reliability of the measurements using the intraclass correlation coefficient (ICC). From the food frequency questionnaire (FFQ) of the PREDIMED-Plus study, adherence to a Mediterranean diet pattern was evaluated using DS, and its correlation and agreement with aDS was assessed. In both cases the lineal regression, Bland-Altman, and kappa index techniques were used. RESULTS: A total of 142 subjects participated, mostly men (56.3%), with a mean age of 64.6+/-4.9 years. In terms of reproducibility, a Pearson correlation coefficient of 0.538 was obtained; a mean of the differences of 2.03 points, and a weighted kappa index of 0.400 (95% CI=0.295-0.577). The instrument had good internal consistency (Cronbach's alpha=0.699), as well as good reliability (CCI=0.931). The aDS had a correlation coefficient with the DS of 0.517, a mean difference of 1.19 points, and a weighted kappa index of 0.450 (95% CI=0.366-0.532). CONCLUSIONS: The aDS has moderate reproducibility and a good correlation and agreement with the DS, so it can be a useful tool in Primary Care to assess adherence to the Mediterranean diet