Iodine intake was estimated from a structured six-day iodine-specific food diary designed and validated for this study (22). The food diary was filled out on six consecutive days at baseline and postintervention (between gestational week 18–19 and gestational week 35–36, respectively) at the exact same days as the spot urinary samples. The food diary included food items of iodine-rich foods (fish and seafood, milk and dairy products, and eggs) in addition to supplements used. The food diary was developed specifically for this study and has been validated and described in detail by Næss et al. (22). The article includes information of iodine content of the specific food items used, including cod, for calculation of iodine intake. For data on the use of iodine supplements since becoming pregnant, we used data from an iodine-specific food frequency questionnaire, which is also validated and described in detailed by Næss et al. (22). To retrieve the iodine content of the cod given in the intervention, 30 individual cod samples from the batch used in the intervention were analyzed at the IMR using ICP-MS, the method has previously been described in detail elsewhere (23).

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