Comparison of I-FFQ and Two Reference Methods

Completed

• Conditions: Iodine Deficiency

• Registration Number: NCT05934006
• Lead Sponsor: University of Bergen

Brief Summary

Mild-to-moderate iodine deficiency remains a problem in many parts of the world, including Norway. Of particular concern are fertile, pregnant, and lactating women. The Norwegian Dairy Council developed a digital iodine-specific food frequency questionnaire (I-FFQ) for the assessment of iodine intake levels, but it has yet to be validated. The main objective was thus to investigate the relative validity of the I-FFQ by comparing estimates of iodine intake obtained from the I-FFQ against a single 24-hour recall (24HR) and urinary iodine concentration (UIC) in fertile women.

Detailed Description

Not available

Study Timeline

• Study Start: 2021-08-10
• Primary Completion: 2022-01-01
• Study Completion: 2022-06-15
• Study First Submitted: 2023-03-06
• Status Verified: 2023-07
• Study First Submitted QC: 2023-07-03
• Last Update Submitted: 2023-07-03
• Study First Posted: 2023-07-06
• Last Update Posted: 2023-07-06

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 72

Inclusion Criteria

• healthy women aged 18-40 years
• sufficient language skills to be able to complete the questionnaires in Norwegian
• be able to meet physically at the study center in Bergen

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Exclusion Criteria

• being pregnant, lactating, or having known thyroid disease

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Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Comparison of FFQ with urinary iodine concentration	One week	Comparison of estimated iodine intake from food-frequency questionnaire (FFQ) with urinary iodine concentration (UIC)
Comparison of FFQ with 24-hour recall	One week	Comparison of estimated dietary iodine intake from food-frequency questionnaire (FFQ) with dietary iodine intake from 24-hour recall

Trial Locations

Locations (1)

University of Bergen; 🇳🇴 Bergen, Norway