Preconception Maternal Iodine Status and Offspring Cognitive Function:

University Hospital Southampton NHS Foundation Trust

Status

Completed

Conditions

Cognitive Function

Treatments

Other: Exposure is maternal iodine

Study type

Observational

Funder types

Other

Identifiers

NCT03322163

Iodine*CogFn

Details and patient eligibility

About

Little is known about maternal iodine nutrition before conception and its relation with the child's cognitive function. Using samples and data from the Southampton Women's Survey, iodine measurements from urine collected before the mothers became pregnant will be related to cognitive function measures in the children at age 6-7 years.

Full description

Adverse effects of severe maternal iodine deficiency in pregnancy on fetal brain development are well-established, but the effects of mild or moderate deficiency are not well understood. To date, most studies have examined iodine status in pregnancy; less is known about maternal iodine nutrition before conception, and this study aims to address that gap in information

The Southampton Women's Survey (SWS) is a prospective study of mothers and children, established in 1998. A general population sample of 12,583 non-pregnant women, aged 20-34 years resident in Southampton was recruited (1998-2002). All women were visited at home by a research nurse and characterised in detail, including assessments of diet, lifestyle and body composition. Between 1998 and 2007, 3158 of the SWS women became pregnant, and went on to deliver a live singleton infant. These women were followed up in through pregnancy and their children have been assessed in a number of follow-up studies in infancy and childhood. These have included repeated assessments of diet, anthropometry and body composition, as well as detailed functional measurements at specific ages, and are ongoing.

At the 6-7 year assessment, the children's cognitive function was measured and this is the primary outcome.

Spot urine samples were collected from the SWS women at clinic visits following their initial interviews (median 33 (IQR 15-87) days), in the period before conception. The time of day was recorded for each urine collection. Urine samples were split divided into aliquots on the day of collection. They were frozen and stored at -80⁰oC from the date of collection until being thawed and assayed for iodine and creatinine contents in 2016 by the Trace Element Unit, Southampton General NHS Trust Hospital, Southampton, UK.

Enrollment

12,583 patients

Sex

All

Ages

6 to 7 years old

Volunteers

Accepts Healthy Volunteers

Inclusion criteria