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For questions 23-25, use the following information. While iodine nutrition has improved worldwide due to the existence of cost-effective prevention measures such as iodization of salt, iodine deficiency remains the leading cause of preventable brain damage in childhood. Urinary iodine is the recommended indicator for evaluating the degree of iodine deficiency, and for monitoring and evaluating its correction. Based on the current recommendations produced by the World Health Organization (WHO), United Nations Children's Fund (UNICEF) and International Council for Control of Iodine Deficiency Disorders (ICCIDD), the epidemiologic criteria for assessing iodine nutrition based on median urinary iodine concentrations in school- age children are provided in the table below. Median Urinary lodine (ug/L) lodine Intake lodine Nutrition Status