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Median thyroid-stimulating hormone (TSH) concentration and the percentage of newborn TSH concentration >5 mIU/l by neonatal age at blood sampling and fortification period (
, median, pre-fortification period; 
, median, transition period; 
, median, post-fortification period; 
, percentage, pre-fortification period; 
, percentage, transition period; 
, percentage, post-fortification period), 2005–2016, South Australia (n 239 182)
