How do you create a food frequency questionnaire?
Development of the FFQ was divided into three major steps: (a) the creation of a food list after a pilot 24-hour diet recall study; (b) prioritisation and categorisation of food items; and (c) assignment of food frequency intake and portion size.
What is food frequency questionnaire method?
Description. A food frequency questionnaire (FFQ) consists of a finite list of foods and beverages with response categories to indicate usual frequency of consumption over the time period queried. To assess the total diet, the number of foods and beverages queried typically ranges from 80 to 120.
What is the purpose of a food frequency questionnaire?
Food frequency questionnaires (FFQs) are designed to assess habitual diet by asking about the frequency with which food items or specific food groups are consumed over a reference period.
Which type of study most often uses food frequency questionnaires?
The food frequency questionnaire (FFQ) is one of the most common tools used in large-scale population-based studies to examine the relation between diet and disease, owing to easy administration and low cost [2, 3].
How do you validate a food frequency questionnaire?
According to Mascarenhas et al. [12], FFQs are typically validated by comparing the results with reference methods, such as 24-h diet recalls or dietary records. Dietary records, which are more accurate than other methods, provide information about absolute and relative intakes [9].
What is diet history questionnaire?
The Diet History Questionnaire (DHQ) is a freely available food frequency questionnaire (FFQ) for use with adults 19 or more years of age. The most recent version, DHQ III, can be used by researchers, clinicians, or educators to assess food and dietary supplement intakes.
What is the major weakness of a food frequency questionnaire?
Disadvantages include cost and administration time; the need to obtain multiple recalls to reliably estimate usual intake; participant burden; and literacy demands in the estimation of portion size (12).
Are food frequency questionnaires reliable?
Cronbach’s alpha values (0.708 to 0.824) and intraclass correlation coefficients (0.710 to 0.826) showed good agreement between repeated FFQs. The results suggest that the FFQ has acceptable validity and good reliability. Hence, the FFQ can be used to assess preschool children’s food intake.
Which of the following is a common drawback to the food frequency questionnaire?
Usual frequency of intake is prone to measurement error, particularly with recall periods longer than seven days (and usual portion size questions are prone to measurement error) If the FFQ is too long it can be more time consuming to administer than a standard 24-hour Dietary Recall and cause respondent fatigue.
How accurate are food frequency questionnaires?
When FFQs do include questions about quantity consumed it is typically based on standard portion sizes, rather than direct weight or use of household utensils. Therefore, FFQs are not as accurate as other quantitative dietary assessment methods (e.g. 24-hour Dietary Recall) (Coates et al., 2012).
Are food frequency questionnaires valid?
What is the time period of recall for the food frequency questionnaire?
FFQ recall periods vary greatly, but typically range from 7 to 30 days (although some are as long as one year).