Improved iodine status in Tasmanian schoolchildren after fortification of bread: a recipe for national success.

Objectives: To examine population iodine status in Tasmania after mandatory iodine fortification of bread and assess the magnitude of difference compared with results from a period of voluntary iodine fortification.

Design And Setting: A cross-sectional urinary iodine survey of schoolchildren from classes that included fourth-grade students was conducted in Tasmania in 2011. Results were compared with surveys conducted before fortification and during a period of voluntary fortification.