Effects of pre and postnatal exposure to low levels of polybromodiphenyl ethers on neurodevelopment and thyroid hormone levels at 4Â years of age

► Early exposure to PBDEs can be detrimental for neurodevelopment in children. ► Neurodevelopment and thyroid hormone levels were assessed at age 4 years. ► Postnatal levels increased the risk of attention deficit and social competence. ► Levels of thyroid hormones were not associated to PBDE 47 exposure. ► The effects were not modified by any other type of organochlorine compounds.