Development of a Web-Based Food Frequency Questionnaire and Diet Quality Score for Turkish Adults
Development of a Web-Based Food Frequency Questionnaire and Diet Quality Score for Turkish Adults: Validity and Reliability
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Background: Non-communicable diseases (NCDs), such as cardiovascular diseases, are important global health concerns. Accurate dietary assessment is pivotal in understanding the relationship between food intake and health outcomes. Presently, there is a notable absence of a comprehensive dietary assessment tool tailored for the Turkish population.
Objective: The primary objective of this research is to adapt and validate the web-based eNutri Food Frequency Questionnaire (FFQ) and Diet Quality Score (DQS) for the Turkish population, addressing the current gap in dietary assessment methods.
Design and Proposed Analysis: The first part of the study will involve adapting the UK-based e-Nutri FFQ to reflect dietary habits of Turkish adults (eNutri-Turkey), such as revising the food list, taking portion size photos, and incorporating Turkish food composition data. The revised FFQ delivered online will be validated against three 24-hour recalls by phone (reference method) and the FFQ will be administered twice to assess reproducibility. The study will employ Cronbach's Alpha for internal consistency and the Bland-Altman method for validity. Additionally, inter-rater reliability and reproducibility will be assessed through Cohen's Kappa and ICC analysis, respectively. The eNutri DQS will be adapted in accordance with Turkish dietary guidelines. Following the adaptation, its validity will be assessed using existing Turkish population nutrient data. This analysis will involve retrospectively calculating the DQS and examining its associations with key risk markers of chronic diseases (BMI, blood pressure, blood glucose and cholesterol levels). Additionally, two qualitative studies will be conducted before starting the validation study. Dietitians and nutrition academics from Turkey (n=10) will provide insights on the suitability and effectiveness of eNutri-Turkey through one-to-one interviews. Feedback received will be used to improve the FFQ and DQS.
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
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Beykoz
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İstanbul, Beykoz, Turkey, 34810
- Istanbul Medipol University
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Adult
- Older Adult
Accepts Healthy Volunteers
Sampling Method
Study Population
Description
Inclusion Criteria:
- Adults aged 18-65 years.
- No diagnosed medical conditions (e.g., diabetes, heart disease, cancer, gastrointestinal conditions).
- Not pregnant or lactating.
- No food allergies or intolerances.
- Not following a specialized diet (e.g., vegan, weight-loss, sports nutrition regimen; vegetarians are eligible).
- Not receiving face-to-face nutritional services or dietary advice from a medical professional.
- Not participating in another nutrition study.
- Residing in Turkey.
Exclusion Criteria:
- Individuals with any diagnosed medical conditions.
- Pregnant or lactating women.
- Individuals with food allergies or intolerances.
- Those following a specialized diet (except vegetarians).
- Participants currently receiving face-to-face nutritional services or dietary advice.
- Individuals involved in another nutrition study.
- Individuals residing outside of Turkey.
Study Plan
How is the study designed?
Design Details
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
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Validity of the web-based FFQ
Time Frame: 14-day period
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Assesses the validity of the adapted eNutri FFQ by comparing its results with those from three 24-hour dietary recalls.
Validity is evaluated based on nutrient intake measurements.
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14-day period
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Reproducibility of the web-based FFQ
Time Frame: 14-day period
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Measures reproducibility by administering the FFQ twice to participants and analyzing the consistency of the results.
Consistency of results; statistical measures will be used for analysis.
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14-day period
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
|---|---|---|
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Usability of the web-based FFQ
Time Frame: Immediately after the first FFQ administration
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Evaluates usability through participant feedback on a scale (e.g., Likert scale) on the clarity and ease of use of the FFQ and portion size images.
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Immediately after the first FFQ administration
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Usability Comparison of 24-Hour Recall and web-based FFQ
Time Frame: Immediately after the second FFQ administration
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Compares dietary intake data obtained from the 24-hour recall method (reference method) with that obtained from the FFQ administered after the second FFQ to assess usability.
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Immediately after the second FFQ administration
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Collaborators and Investigators
Sponsor
Collaborators
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- E-10840098-772.02-6576
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
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