Yu Chen|Habibul Ahsan|Faruque Parvez|Geoffrey R. Howe
Validity of a food-frequency questionnaire for a large prospective cohort study in Bangladesh
Columbia University|Columbia University|Columbia University Irving Medical Center|Columbia University|Columbia University
developed thirtynineitem semiquantitative foodfrequency questionnaire ffq assess dietary consumption 11746 men women prospective cohort study evaluates health effects drinking water bangladesh order validate ffq two 7 food diaries fd completed 189 randomly selected cohort participants two different seasons year nutrient values converted based united states department agricultures national nutrient database food composition table indian subcontinent pearson productmoment spearman nonparametric rank correlation coefficients comparing food nutrient consumptions estimated ffq 7 fd calculated based logtransformed consumption values without adjustment total energy correction withinindividual variation correlations macronutrients common micronutrients including total fat monounsaturated fat polyunsaturated fat saturated fat protein carbohydrate dietary fibre na k vitamin b6 vitamin b12 riboflavin mn thiamin fe moderately good ranging 030 076 however correlations micronutrients weak 030 large seasonal variations intakes retinol equivalents vitamin c observed analysis documents degree validity ffq measuring specific nutrient intakes study population knowledge present study first document validity ffq use 7 fd bangladeshi population