Turkish Validation of Flavonoids Specific Food Frequency Questionnaire: A Validity and Reliability

Flavonoids are a diverse group of polyphenolic compounds found in plants that can be taken in the diet. Also flavonoids have six subsclasses: anthocyanins, flavonols flavanones, flavanols, flavones ve izoflavones. The aim of this study is to determine the validity and reability of the flavonoids specific food frequency questionnaire. 129 Adult individuals between the ages of 19-65 participated in the study , which was planned in three stages. The flavonoids specific food frequency questionnaire includes a total of 79 foods and consist of 5 sections: soft drinks, alcoholic beverages, vegetables, fruits and others. In the first stage, flavonoids specific food frequency questionnaire was applied, adapted to Turkish population, which could be answered online. In the second stage, one day food consumption record was taken from individuals. In the third stage, the food consumption frequency questionnaire specific to flavonoids was re-applied. When the BTK and BTS1 values are examined, it is seen that the flavonoid and subclass values calculated in BTS1 are higher. There is a significant difference in the intake of dietary flavonoid and flavonoid subclasses for both the first application of the Flavonoids Specific Food Frequency Survey and the one day food consumption record. Spearman's correlation coefficient was examined to evaluate the reproducibility between BTS1 and BTS2, and a high correlation was found between total flavonoid, flavan-3-ol, and flovonol intakes, and a moderate relationship was found between anthocyanin and flavanone intakes. The survey is considered suitable for ranking individuals by total flavonoid intake but shows limitations to estimate absolute total flavonoid and subclass intake.