By applying the WHO/UNICEF/ICCIDD guidelines for the Assessment of Iodine Deficiency Monitoring using Thyroid Stimulating Hormone (TSH) with the use of a Geographic Information System technique, the degree of severity of iodine deficiency for various areas can be evaluated. In this study, TSH data for neonates born in all 76 provinces of Thailand during 2003-2006 were classified according to th...