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Table 1 PICOS criteria for inclusion and exclusion of studies

From: Associations between maternal urinary iodine assessment, dietary iodine intakes and neurodevelopmental outcomes in the child: a systematic review

  Inclusion criteria Exclusion criteria
Population Pregnant women and their children. Studies including women of childbearing age but not during pregnancy and/or post-natally will be excluded.
Intervention Assessment of dietary contributors to iodine status during pregnancy and neurodevelopment outcomes in offspring including natural dietary sources and “accidental” supplementation e.g., women taking supplement prior to/not as part of the study. Any articles involving intentional dietary supplementation of iodine will be excluded.
Comparison Pregnant women with low iodine status during pregnancy and/or associations with neurodevelopment in offspring. Studies that have no detail on iodine status and/or cognitive outcomes during pregnancy on offspring.
Outcomes The main dietary contributors to iodine status during pregnancy and/or associations with neurodevelopment in offspring. Studies that did not measure child cognitive/neurodevelopment outcomes and/or detail urinary iodine measurements or dietary data.
Study Design All study types e.g., Prospective Cohort, Observational studies, and cross-sectional studies. Animal study, in vitro study, drug study, chemical interaction study, laboratory study, food technology study, cell culture study, method development paper, Fortification studies, Supplementation trials, research policy/ policy making, proof of concept, letters, editorials, systematic reviews and meta-analyses, commentaries, studies not published in the English language.