A national survey reports that the total goitre rate (TGR) among 6-12 year old children in a district is 12%. According to WHO/UNICEF/ICCIDD criteria, the severity of iodine deficiency in this district is classified as:

• A Endemic but not public health significance
• B Moderate (TGR 20-29.9%)
• C Severe (TGR ≥30%)
• D Mild (TGR 5-19.9%) ✓

Explanation

WHO classification: TGR 5-19.9% indicates mild iodine deficiency, 20-29.9% moderate, and ≥30% severe. TGR of 12% falls in the mild range. Indian convention follows WHO thresholds. The TGR in school-age children is the principal epidemiological indicator for iodine deficiency disorders under the National Iodine Deficiency Disorders Control Programme (NIDDCP).

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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