Comparison of I-FFQ and Two Reference Methods

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.

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Key information

Conditions

Iodine Deficiency

Age range

18 year–40 year

Sex eligibility

Female

Study type

Observational

Primary location

University of Bergen

Bergen, 5021, Norway

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

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

Exclusion criteria

being pregnant, lactating, or having known thyroid disease

Treatment and study plan

spot urine samples

Biological

No intervention, but measurement of urinary iodine concentration by 6 repeated spot urine samples

Primary outcomes

Comparison of FFQ with 24-hour recall

Time frame: One week

Comparison of estimated dietary iodine intake from food-frequency questionnaire (FFQ) with dietary iodine intake from 24-hour recall
Comparison of FFQ with urinary iodine concentration

Time frame: One week

Comparison of estimated iodine intake from food-frequency questionnaire (FFQ) with urinary iodine concentration (UIC)

Sponsors and collaborators

Lead sponsor

University of Bergen

Other

Collaborators

Institute of Marine Research
National Dairy Council

Registry information

Official study title

Comparison of a Digital Iodine-specific Food Frequency Questionnaire With 24-hour Recall and Urinary Iodine Concentration

Important dates

Study start: 2021
Primary completion: 2022
Study completion: 2022
First posted: Jul 6, 2023
Registry last updated: Jul 6, 2023

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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Completed